[syzbot] [mm?] WARNING in folio_lruvec_relock_irqsave
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syzbot
May 19, 2026, 7:06:22 PM (16 hours ago) May 19
to ak...@linux-foundation.org, axelra...@google.com, bao...@kernel.org, b...@redhat.com, chr...@kernel.org, kas...@tencent.com, linux-...@vger.kernel.org, linu...@kvack.org, nph...@gmail.com, qi.z...@linux.dev, shakee...@linux.dev, shik...@huaweicloud.com, syzkall...@googlegroups.com, wei...@google.com, youngj...@lge.com, yua...@google.com
Hello,
syzbot found the following issue on:
HEAD commit: 5cbb61bf4168 arm64/fpsimd: ptrace: zero target's fpsimd_st..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1068e8a6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a834c6344141a58b
dashboard link: https://syzkaller.appspot.com/bug?extid=c6d89774c5884660f0db
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/04156ec16593/disk-5cbb61bf.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6bfa041e2c79/vmlinux-5cbb61bf.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a92d82d8a79e/Image-5cbb61bf.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c6d897...@syzkaller.appspotmail.com
------------[ cut here ]------------
WARNING: ./include/linux/memcontrol.h:380 at obj_cgroup_memcg include/linux/memcontrol.h:380 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at folio_memcg include/linux/memcontrol.h:434 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at folio_matches_lruvec include/linux/memcontrol.h:1501 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at folio_lruvec_relock_irqsave+0x320/0x3a8 include/linux/memcontrol.h:1523, CPU#1: dhcpcd/4655
Modules linked in:
CPU: 1 UID: 0 PID: 4655 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : obj_cgroup_memcg include/linux/memcontrol.h:380 [inline]
pc : folio_memcg include/linux/memcontrol.h:434 [inline]
pc : folio_matches_lruvec include/linux/memcontrol.h:1501 [inline]
pc : folio_lruvec_relock_irqsave+0x320/0x3a8 include/linux/memcontrol.h:1523
lr : obj_cgroup_memcg include/linux/memcontrol.h:380 [inline]
lr : folio_memcg include/linux/memcontrol.h:434 [inline]
lr : folio_matches_lruvec include/linux/memcontrol.h:1501 [inline]
lr : folio_lruvec_relock_irqsave+0x320/0x3a8 include/linux/memcontrol.h:1523
sp : ffff8000964373a0
x29: ffff8000964373a0 x28: 1fffffbff86a96a0 x27: 00000000f5000000
x26: ffff0000c1939b00 x25: 1ffff00012c86e97 x24: dfff800000000000
x23: 0000000000000000 x22: ffff0000c1862980 x21: ffff8000964374e0
x20: fffffdffc354b500 x19: ffff8000964374b8 x18: 00000000ffffffff
x17: ffff80008a0cdc80 x16: ffff80008a3b24b8 x15: ffff0000cb5c0b50
x14: ffff0000cb5c0b30 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000001
x8 : 0000000000000000 x7 : ffff800080bce9cc x6 : 0000000000000000
x5 : 0000000000000030 x4 : 0000000000000000 x3 : ffff800080941e90
x2 : 0000000000000000 x1 : ffff0000cb5c0000 x0 : 0000000000000000
Call trace:
obj_cgroup_memcg include/linux/memcontrol.h:380 [inline] (P)
folio_memcg include/linux/memcontrol.h:434 [inline] (P)
folio_matches_lruvec include/linux/memcontrol.h:1501 [inline] (P)
folio_lruvec_relock_irqsave+0x320/0x3a8 include/linux/memcontrol.h:1523 (P)
__page_cache_release+0xa8/0x860 mm/swap.c:77
folios_put_refs+0x57c/0x8dc mm/swap.c:993
free_pages_and_swap_cache+0x238/0x3e0 mm/swap_state.c:401
__tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0xf0/0x33c mm/mmu_gather.c:424
tlb_finish_mmu+0xf4/0x228 mm/mmu_gather.c:549
exit_mmap+0x3d0/0xaf8 mm/mmap.c:1313
__mmput+0xe4/0x2f0 kernel/fork.c:1178
mmput+0x70/0xa8 kernel/fork.c:1201
exit_mm+0x134/0x1e8 kernel/exit.c:581
do_exit+0x518/0x1a6c kernel/exit.c:963
do_group_exit+0x194/0x22c kernel/exit.c:1117
__do_sys_exit_group kernel/exit.c:1128 [inline]
__se_sys_exit_group kernel/exit.c:1126 [inline]
pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
irq event stamp: 1602
hardirqs last enabled at (1601): [<ffff800086744048>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
hardirqs last enabled at (1601): [<ffff800086744048>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198
hardirqs last disabled at (1602): [<ffff800086743e78>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline]
hardirqs last disabled at (1602): [<ffff800086743e78>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:166
softirqs last enabled at (1134): [<ffff800084ab928c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (1132): [<ffff800084ab9258>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: ./include/linux/memcontrol.h:380 at obj_cgroup_memcg include/linux/memcontrol.h:380 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at folio_memcg include/linux/memcontrol.h:434 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at folio_matches_lruvec include/linux/memcontrol.h:1501 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at lruvec_del_folio include/linux/mm_inline.h:383 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at __page_cache_release+0x6ec/0x860 mm/swap.c:78, CPU#1: dhcpcd/4655
Modules linked in:
CPU: 1 UID: 0 PID: 4655 Comm: dhcpcd Tainted: G W syzkaller #0 PREEMPT
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : obj_cgroup_memcg include/linux/memcontrol.h:380 [inline]
pc : folio_memcg include/linux/memcontrol.h:434 [inline]
pc : folio_matches_lruvec include/linux/memcontrol.h:1501 [inline]
pc : lruvec_del_folio include/linux/mm_inline.h:383 [inline]
pc : __page_cache_release+0x6ec/0x860 mm/swap.c:78
lr : obj_cgroup_memcg include/linux/memcontrol.h:380 [inline]
lr : folio_memcg include/linux/memcontrol.h:434 [inline]
lr : folio_matches_lruvec include/linux/memcontrol.h:1501 [inline]
lr : lruvec_del_folio include/linux/mm_inline.h:383 [inline]
lr : __page_cache_release+0x6ec/0x860 mm/swap.c:78
sp : ffff800096437400
x29: ffff800096437420 x28: 1fffffbff86a96a0 x27: dfff800000000000
x26: 1fffffbff86a96a1 x25: 0000000000000000 x24: ffff0000c1862980
x23: ffff0000c18c0c08 x22: 0000000000000000 x21: 1fffe00018318181
x20: fffffdffc354b508 x19: fffffdffc354b500 x18: 00000000ffffffff
x17: ffff80008a0cdc80 x16: ffff80008a3b24b8 x15: ffff0000cb5c0b50
x14: ffff0000cb5c0b30 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000001
x8 : 0000000000000000 x7 : ffff800080bce9cc x6 : 0000000000000000
x5 : 0000000000000030 x4 : 0000000000000000 x3 : ffff800080940708
x2 : 0000000000000000 x1 : ffff0000cb5c0000 x0 : 0000000000000000
Call trace:
obj_cgroup_memcg include/linux/memcontrol.h:380 [inline] (P)
folio_memcg include/linux/memcontrol.h:434 [inline] (P)
folio_matches_lruvec include/linux/memcontrol.h:1501 [inline] (P)
lruvec_del_folio include/linux/mm_inline.h:383 [inline] (P)
__page_cache_release+0x6ec/0x860 mm/swap.c:78 (P)
folios_put_refs+0x57c/0x8dc mm/swap.c:993
free_pages_and_swap_cache+0x238/0x3e0 mm/swap_state.c:401
__tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0xf0/0x33c mm/mmu_gather.c:424
tlb_finish_mmu+0xf4/0x228 mm/mmu_gather.c:549
exit_mmap+0x3d0/0xaf8 mm/mmap.c:1313
__mmput+0xe4/0x2f0 kernel/fork.c:1178
mmput+0x70/0xa8 kernel/fork.c:1201
exit_mm+0x134/0x1e8 kernel/exit.c:581
do_exit+0x518/0x1a6c kernel/exit.c:963
do_group_exit+0x194/0x22c kernel/exit.c:1117
__do_sys_exit_group kernel/exit.c:1128 [inline]
__se_sys_exit_group kernel/exit.c:1126 [inline]
pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
irq event stamp: 1602
hardirqs last enabled at (1601): [<ffff800086744048>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
hardirqs last enabled at (1601): [<ffff800086744048>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198
hardirqs last disabled at (1602): [<ffff800086743e78>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline]
hardirqs last disabled at (1602): [<ffff800086743e78>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:166
softirqs last enabled at (1134): [<ffff800084ab928c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (1132): [<ffff800084ab9258>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
=====================================
WARNING: bad unlock balance detected!
syzkaller #0 Tainted: G W
-------------------------------------
dhcpcd/4655 is trying to release lock (rcu_read_lock) at:
[<ffff800080941c44>] rcu_lock_release+0x10/0x38 include/linux/rcupdate.h:309
but there are no more locks to release!
other info that might help us debug this:
1 lock held by dhcpcd/4655:
#0: ffff0000d1fb0d78 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:536 [inline]
#0: ffff0000d1fb0d78 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x228/0xaf8 mm/mmap.c:1308
stack backtrace:
CPU: 1 UID: 0 PID: 4655 Comm: dhcpcd Tainted: G W syzkaller #0 PREEMPT
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
dump_stack+0x1c/0x28 lib/dump_stack.c:129
print_unlock_imbalance_bug+0xf4/0xfc kernel/locking/lockdep.c:5298
__lock_release kernel/locking/lockdep.c:-1 [inline]
lock_release+0x1dc/0x3b0 kernel/locking/lockdep.c:5889
rcu_lock_release+0x2c/0x38 include/linux/rcupdate.h:310
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
lruvec_unlock_irqrestore include/linux/memcontrol.h:1493 [inline]
folios_put_refs+0x7a4/0x8dc mm/swap.c:1000
free_pages_and_swap_cache+0x238/0x3e0 mm/swap_state.c:401
__tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0xf0/0x33c mm/mmu_gather.c:424
tlb_finish_mmu+0xf4/0x228 mm/mmu_gather.c:549
exit_mmap+0x3d0/0xaf8 mm/mmap.c:1313
__mmput+0xe4/0x2f0 kernel/fork.c:1178
mmput+0x70/0xa8 kernel/fork.c:1201
exit_mm+0x134/0x1e8 kernel/exit.c:581
do_exit+0x518/0x1a6c kernel/exit.c:963
do_group_exit+0x194/0x22c kernel/exit.c:1117
__do_sys_exit_group kernel/exit.c:1128 [inline]
__se_sys_exit_group kernel/exit.c:1126 [inline]
pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
------------[ cut here ]------------
WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x98/0x104 kernel/rcu/tree_plugin.h:445, CPU#1: dhcpcd/4655
Modules linked in:
CPU: 1 UID: 0 PID: 4655 Comm: dhcpcd Tainted: G W syzkaller #0 PREEMPT
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __rcu_read_unlock+0x98/0x104 kernel/rcu/tree_plugin.h:445
lr : rcu_read_unlock include/linux/rcupdate.h:871 [inline]
lr : lruvec_unlock_irqrestore include/linux/memcontrol.h:1493 [inline]
lr : folios_put_refs+0x7a8/0x8dc mm/swap.c:1000
sp : ffff800096437440
x29: ffff800096437450 x28: ffff800096437778 x27: ffff8000964376b8
x26: 000000000000001e x25: fffffdffc76e19c0 x24: ffff8000964375c0
x23: fffffdffc76e19f4 x22: ffff800096437778 x21: dfff800000000000
x20: 1fffe000196b8090 x19: ffff0000cb5c0484 x18: 1fffe00035c25820
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000
x11: 000000000000065a x10: 0000000000000003 x9 : 0000000000000007
x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff8000804886d0
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008048c3e0
x2 : 0000000100000000 x1 : ffff0000cb5c0000 x0 : ffff0000cb5c0000
Call trace:
__rcu_read_unlock+0x98/0x104 kernel/rcu/tree_plugin.h:445 (P)
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
lruvec_unlock_irqrestore include/linux/memcontrol.h:1493 [inline]
folios_put_refs+0x7a8/0x8dc mm/swap.c:1000
free_pages_and_swap_cache+0x238/0x3e0 mm/swap_state.c:401
__tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0xf0/0x33c mm/mmu_gather.c:424
tlb_finish_mmu+0xf4/0x228 mm/mmu_gather.c:549
exit_mmap+0x3d0/0xaf8 mm/mmap.c:1313
__mmput+0xe4/0x2f0 kernel/fork.c:1178
mmput+0x70/0xa8 kernel/fork.c:1201
exit_mm+0x134/0x1e8 kernel/exit.c:581
do_exit+0x518/0x1a6c kernel/exit.c:963
do_group_exit+0x194/0x22c kernel/exit.c:1117
__do_sys_exit_group kernel/exit.c:1128 [inline]
__se_sys_exit_group kernel/exit.c:1126 [inline]
pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
irq event stamp: 1631
hardirqs last enabled at (1631): [<ffff8000803bd554>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1644 [inline]
hardirqs last enabled at (1631): [<ffff8000803bd554>] finish_lock_switch+0x160/0x204 kernel/sched/core.c:5124
hardirqs last disabled at (1630): [<ffff80008672f800>] __schedule+0x308/0x2d24 kernel/sched/core.c:7042
softirqs last enabled at (1628): [<ffff800080309064>] softirq_handle_end kernel/softirq.c:468 [inline]
softirqs last enabled at (1628): [<ffff800080309064>] handle_softirqs+0xbc4/0xd34 kernel/softirq.c:650
softirqs last disabled at (1605): [<ffff8000800204b0>] __do_softirq+0x14/0x20 kernel/softirq.c:656
---[ end trace 0000000000000000 ]---
BUG: sleeping function called from invalid context at mm/mmu_gather.c:142
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 4655, name: dhcpcd
preempt_count: 0, expected: 0
RCU nest depth: -1, expected: 0
INFO: lockdep is turned off.
CPU: 1 UID: 0 PID: 4655 Comm: dhcpcd Tainted: G W syzkaller #0 PREEMPT
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
dump_stack+0x1c/0x28 lib/dump_stack.c:129
__might_resched+0x350/0x4ac kernel/sched/core.c:9162
__tlb_batch_free_encoded_pages mm/mmu_gather.c:142 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0x114/0x33c mm/mmu_gather.c:424
tlb_finish_mmu+0xf4/0x228 mm/mmu_gather.c:549
exit_mmap+0x3d0/0xaf8 mm/mmap.c:1313
__mmput+0xe4/0x2f0 kernel/fork.c:1178
mmput+0x70/0xa8 kernel/fork.c:1201
exit_mm+0x134/0x1e8 kernel/exit.c:581
do_exit+0x518/0x1a6c kernel/exit.c:963
do_group_exit+0x194/0x22c kernel/exit.c:1117
__do_sys_exit_group kernel/exit.c:1128 [inline]
__se_sys_exit_group kernel/exit.c:1126 [inline]
pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
---
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syzbot found the following issue on:
HEAD commit: 5cbb61bf4168 arm64/fpsimd: ptrace: zero target's fpsimd_st..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1068e8a6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a834c6344141a58b
dashboard link: https://syzkaller.appspot.com/bug?extid=c6d89774c5884660f0db
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/04156ec16593/disk-5cbb61bf.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6bfa041e2c79/vmlinux-5cbb61bf.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a92d82d8a79e/Image-5cbb61bf.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c6d897...@syzkaller.appspotmail.com
------------[ cut here ]------------
WARNING: ./include/linux/memcontrol.h:380 at obj_cgroup_memcg include/linux/memcontrol.h:380 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at folio_memcg include/linux/memcontrol.h:434 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at folio_matches_lruvec include/linux/memcontrol.h:1501 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at folio_lruvec_relock_irqsave+0x320/0x3a8 include/linux/memcontrol.h:1523, CPU#1: dhcpcd/4655
Modules linked in:
CPU: 1 UID: 0 PID: 4655 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : obj_cgroup_memcg include/linux/memcontrol.h:380 [inline]
pc : folio_memcg include/linux/memcontrol.h:434 [inline]
pc : folio_matches_lruvec include/linux/memcontrol.h:1501 [inline]
pc : folio_lruvec_relock_irqsave+0x320/0x3a8 include/linux/memcontrol.h:1523
lr : obj_cgroup_memcg include/linux/memcontrol.h:380 [inline]
lr : folio_memcg include/linux/memcontrol.h:434 [inline]
lr : folio_matches_lruvec include/linux/memcontrol.h:1501 [inline]
lr : folio_lruvec_relock_irqsave+0x320/0x3a8 include/linux/memcontrol.h:1523
sp : ffff8000964373a0
x29: ffff8000964373a0 x28: 1fffffbff86a96a0 x27: 00000000f5000000
x26: ffff0000c1939b00 x25: 1ffff00012c86e97 x24: dfff800000000000
x23: 0000000000000000 x22: ffff0000c1862980 x21: ffff8000964374e0
x20: fffffdffc354b500 x19: ffff8000964374b8 x18: 00000000ffffffff
x17: ffff80008a0cdc80 x16: ffff80008a3b24b8 x15: ffff0000cb5c0b50
x14: ffff0000cb5c0b30 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000001
x8 : 0000000000000000 x7 : ffff800080bce9cc x6 : 0000000000000000
x5 : 0000000000000030 x4 : 0000000000000000 x3 : ffff800080941e90
x2 : 0000000000000000 x1 : ffff0000cb5c0000 x0 : 0000000000000000
Call trace:
obj_cgroup_memcg include/linux/memcontrol.h:380 [inline] (P)
folio_memcg include/linux/memcontrol.h:434 [inline] (P)
folio_matches_lruvec include/linux/memcontrol.h:1501 [inline] (P)
folio_lruvec_relock_irqsave+0x320/0x3a8 include/linux/memcontrol.h:1523 (P)
__page_cache_release+0xa8/0x860 mm/swap.c:77
folios_put_refs+0x57c/0x8dc mm/swap.c:993
free_pages_and_swap_cache+0x238/0x3e0 mm/swap_state.c:401
__tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0xf0/0x33c mm/mmu_gather.c:424
tlb_finish_mmu+0xf4/0x228 mm/mmu_gather.c:549
exit_mmap+0x3d0/0xaf8 mm/mmap.c:1313
__mmput+0xe4/0x2f0 kernel/fork.c:1178
mmput+0x70/0xa8 kernel/fork.c:1201
exit_mm+0x134/0x1e8 kernel/exit.c:581
do_exit+0x518/0x1a6c kernel/exit.c:963
do_group_exit+0x194/0x22c kernel/exit.c:1117
__do_sys_exit_group kernel/exit.c:1128 [inline]
__se_sys_exit_group kernel/exit.c:1126 [inline]
pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
irq event stamp: 1602
hardirqs last enabled at (1601): [<ffff800086744048>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
hardirqs last enabled at (1601): [<ffff800086744048>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198
hardirqs last disabled at (1602): [<ffff800086743e78>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline]
hardirqs last disabled at (1602): [<ffff800086743e78>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:166
softirqs last enabled at (1134): [<ffff800084ab928c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (1132): [<ffff800084ab9258>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: ./include/linux/memcontrol.h:380 at obj_cgroup_memcg include/linux/memcontrol.h:380 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at folio_memcg include/linux/memcontrol.h:434 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at folio_matches_lruvec include/linux/memcontrol.h:1501 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at lruvec_del_folio include/linux/mm_inline.h:383 [inline], CPU#1: dhcpcd/4655
WARNING: ./include/linux/memcontrol.h:380 at __page_cache_release+0x6ec/0x860 mm/swap.c:78, CPU#1: dhcpcd/4655
Modules linked in:
CPU: 1 UID: 0 PID: 4655 Comm: dhcpcd Tainted: G W syzkaller #0 PREEMPT
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : obj_cgroup_memcg include/linux/memcontrol.h:380 [inline]
pc : folio_memcg include/linux/memcontrol.h:434 [inline]
pc : folio_matches_lruvec include/linux/memcontrol.h:1501 [inline]
pc : lruvec_del_folio include/linux/mm_inline.h:383 [inline]
pc : __page_cache_release+0x6ec/0x860 mm/swap.c:78
lr : obj_cgroup_memcg include/linux/memcontrol.h:380 [inline]
lr : folio_memcg include/linux/memcontrol.h:434 [inline]
lr : folio_matches_lruvec include/linux/memcontrol.h:1501 [inline]
lr : lruvec_del_folio include/linux/mm_inline.h:383 [inline]
lr : __page_cache_release+0x6ec/0x860 mm/swap.c:78
sp : ffff800096437400
x29: ffff800096437420 x28: 1fffffbff86a96a0 x27: dfff800000000000
x26: 1fffffbff86a96a1 x25: 0000000000000000 x24: ffff0000c1862980
x23: ffff0000c18c0c08 x22: 0000000000000000 x21: 1fffe00018318181
x20: fffffdffc354b508 x19: fffffdffc354b500 x18: 00000000ffffffff
x17: ffff80008a0cdc80 x16: ffff80008a3b24b8 x15: ffff0000cb5c0b50
x14: ffff0000cb5c0b30 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000001
x8 : 0000000000000000 x7 : ffff800080bce9cc x6 : 0000000000000000
x5 : 0000000000000030 x4 : 0000000000000000 x3 : ffff800080940708
x2 : 0000000000000000 x1 : ffff0000cb5c0000 x0 : 0000000000000000
Call trace:
obj_cgroup_memcg include/linux/memcontrol.h:380 [inline] (P)
folio_memcg include/linux/memcontrol.h:434 [inline] (P)
folio_matches_lruvec include/linux/memcontrol.h:1501 [inline] (P)
lruvec_del_folio include/linux/mm_inline.h:383 [inline] (P)
__page_cache_release+0x6ec/0x860 mm/swap.c:78 (P)
folios_put_refs+0x57c/0x8dc mm/swap.c:993
free_pages_and_swap_cache+0x238/0x3e0 mm/swap_state.c:401
__tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0xf0/0x33c mm/mmu_gather.c:424
tlb_finish_mmu+0xf4/0x228 mm/mmu_gather.c:549
exit_mmap+0x3d0/0xaf8 mm/mmap.c:1313
__mmput+0xe4/0x2f0 kernel/fork.c:1178
mmput+0x70/0xa8 kernel/fork.c:1201
exit_mm+0x134/0x1e8 kernel/exit.c:581
do_exit+0x518/0x1a6c kernel/exit.c:963
do_group_exit+0x194/0x22c kernel/exit.c:1117
__do_sys_exit_group kernel/exit.c:1128 [inline]
__se_sys_exit_group kernel/exit.c:1126 [inline]
pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
irq event stamp: 1602
hardirqs last enabled at (1601): [<ffff800086744048>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
hardirqs last enabled at (1601): [<ffff800086744048>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198
hardirqs last disabled at (1602): [<ffff800086743e78>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline]
hardirqs last disabled at (1602): [<ffff800086743e78>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:166
softirqs last enabled at (1134): [<ffff800084ab928c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (1132): [<ffff800084ab9258>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
=====================================
WARNING: bad unlock balance detected!
syzkaller #0 Tainted: G W
-------------------------------------
dhcpcd/4655 is trying to release lock (rcu_read_lock) at:
[<ffff800080941c44>] rcu_lock_release+0x10/0x38 include/linux/rcupdate.h:309
but there are no more locks to release!
other info that might help us debug this:
1 lock held by dhcpcd/4655:
#0: ffff0000d1fb0d78 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:536 [inline]
#0: ffff0000d1fb0d78 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x228/0xaf8 mm/mmap.c:1308
stack backtrace:
CPU: 1 UID: 0 PID: 4655 Comm: dhcpcd Tainted: G W syzkaller #0 PREEMPT
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
dump_stack+0x1c/0x28 lib/dump_stack.c:129
print_unlock_imbalance_bug+0xf4/0xfc kernel/locking/lockdep.c:5298
__lock_release kernel/locking/lockdep.c:-1 [inline]
lock_release+0x1dc/0x3b0 kernel/locking/lockdep.c:5889
rcu_lock_release+0x2c/0x38 include/linux/rcupdate.h:310
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
lruvec_unlock_irqrestore include/linux/memcontrol.h:1493 [inline]
folios_put_refs+0x7a4/0x8dc mm/swap.c:1000
free_pages_and_swap_cache+0x238/0x3e0 mm/swap_state.c:401
__tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0xf0/0x33c mm/mmu_gather.c:424
tlb_finish_mmu+0xf4/0x228 mm/mmu_gather.c:549
exit_mmap+0x3d0/0xaf8 mm/mmap.c:1313
__mmput+0xe4/0x2f0 kernel/fork.c:1178
mmput+0x70/0xa8 kernel/fork.c:1201
exit_mm+0x134/0x1e8 kernel/exit.c:581
do_exit+0x518/0x1a6c kernel/exit.c:963
do_group_exit+0x194/0x22c kernel/exit.c:1117
__do_sys_exit_group kernel/exit.c:1128 [inline]
__se_sys_exit_group kernel/exit.c:1126 [inline]
pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
------------[ cut here ]------------
WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x98/0x104 kernel/rcu/tree_plugin.h:445, CPU#1: dhcpcd/4655
Modules linked in:
CPU: 1 UID: 0 PID: 4655 Comm: dhcpcd Tainted: G W syzkaller #0 PREEMPT
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __rcu_read_unlock+0x98/0x104 kernel/rcu/tree_plugin.h:445
lr : rcu_read_unlock include/linux/rcupdate.h:871 [inline]
lr : lruvec_unlock_irqrestore include/linux/memcontrol.h:1493 [inline]
lr : folios_put_refs+0x7a8/0x8dc mm/swap.c:1000
sp : ffff800096437440
x29: ffff800096437450 x28: ffff800096437778 x27: ffff8000964376b8
x26: 000000000000001e x25: fffffdffc76e19c0 x24: ffff8000964375c0
x23: fffffdffc76e19f4 x22: ffff800096437778 x21: dfff800000000000
x20: 1fffe000196b8090 x19: ffff0000cb5c0484 x18: 1fffe00035c25820
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000
x11: 000000000000065a x10: 0000000000000003 x9 : 0000000000000007
x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff8000804886d0
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008048c3e0
x2 : 0000000100000000 x1 : ffff0000cb5c0000 x0 : ffff0000cb5c0000
Call trace:
__rcu_read_unlock+0x98/0x104 kernel/rcu/tree_plugin.h:445 (P)
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
lruvec_unlock_irqrestore include/linux/memcontrol.h:1493 [inline]
folios_put_refs+0x7a8/0x8dc mm/swap.c:1000
free_pages_and_swap_cache+0x238/0x3e0 mm/swap_state.c:401
__tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0xf0/0x33c mm/mmu_gather.c:424
tlb_finish_mmu+0xf4/0x228 mm/mmu_gather.c:549
exit_mmap+0x3d0/0xaf8 mm/mmap.c:1313
__mmput+0xe4/0x2f0 kernel/fork.c:1178
mmput+0x70/0xa8 kernel/fork.c:1201
exit_mm+0x134/0x1e8 kernel/exit.c:581
do_exit+0x518/0x1a6c kernel/exit.c:963
do_group_exit+0x194/0x22c kernel/exit.c:1117
__do_sys_exit_group kernel/exit.c:1128 [inline]
__se_sys_exit_group kernel/exit.c:1126 [inline]
pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
irq event stamp: 1631
hardirqs last enabled at (1631): [<ffff8000803bd554>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1644 [inline]
hardirqs last enabled at (1631): [<ffff8000803bd554>] finish_lock_switch+0x160/0x204 kernel/sched/core.c:5124
hardirqs last disabled at (1630): [<ffff80008672f800>] __schedule+0x308/0x2d24 kernel/sched/core.c:7042
softirqs last enabled at (1628): [<ffff800080309064>] softirq_handle_end kernel/softirq.c:468 [inline]
softirqs last enabled at (1628): [<ffff800080309064>] handle_softirqs+0xbc4/0xd34 kernel/softirq.c:650
softirqs last disabled at (1605): [<ffff8000800204b0>] __do_softirq+0x14/0x20 kernel/softirq.c:656
---[ end trace 0000000000000000 ]---
BUG: sleeping function called from invalid context at mm/mmu_gather.c:142
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 4655, name: dhcpcd
preempt_count: 0, expected: 0
RCU nest depth: -1, expected: 0
INFO: lockdep is turned off.
CPU: 1 UID: 0 PID: 4655 Comm: dhcpcd Tainted: G W syzkaller #0 PREEMPT
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
dump_stack+0x1c/0x28 lib/dump_stack.c:129
__might_resched+0x350/0x4ac kernel/sched/core.c:9162
__tlb_batch_free_encoded_pages mm/mmu_gather.c:142 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0x114/0x33c mm/mmu_gather.c:424
tlb_finish_mmu+0xf4/0x228 mm/mmu_gather.c:549
exit_mmap+0x3d0/0xaf8 mm/mmap.c:1313
__mmput+0xe4/0x2f0 kernel/fork.c:1178
mmput+0x70/0xa8 kernel/fork.c:1201
exit_mm+0x134/0x1e8 kernel/exit.c:581
do_exit+0x518/0x1a6c kernel/exit.c:963
do_group_exit+0x194/0x22c kernel/exit.c:1117
__do_sys_exit_group kernel/exit.c:1128 [inline]
__se_sys_exit_group kernel/exit.c:1126 [inline]
pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
---
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