[syzbot] [mm?] possible deadlock in try_to_wake_up (5)
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syzbot
May 30, 2024, 2:36:34 PMMay 30
to ak...@linux-foundation.org, linux-...@vger.kernel.org, linu...@kvack.org, net...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 95348e463eab selftests/bpf: Add netkit test for pkt_type
git tree: bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=11646be0980000
kernel config: https://syzkaller.appspot.com/x/.config?x=17ffd15f654c98ba
dashboard link: https://syzkaller.appspot.com/bug?extid=4970d08867f5a5b0bb78
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/45aceeb3f8f5/disk-95348e46.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ff3ff3033939/vmlinux-95348e46.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fdfb9e139fb3/bzImage-95348e46.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4970d0...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
6.9.0-syzkaller-08570-g95348e463eab #0 Not tainted
------------------------------------------------------
syz-executor.0/8491 is trying to acquire lock:
ffff8880176f0a18 (&p->pi_lock){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
ffff8880176f0a18 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262
but task is already holding lock:
ffff8880b9538828 (lock#10){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
ffff8880b9538828 (lock#10){+.+.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x8f/0x630 mm/mmap_lock.c:237
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (lock#10){+.+.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
__mmap_lock_do_trace_acquire_returned+0xa8/0x630 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:166 [inline]
stack_map_get_build_id_offset+0x9b2/0x9d0 kernel/bpf/stackmap.c:141
__bpf_get_stack+0x4ad/0x5a0 kernel/bpf/stackmap.c:449
____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1994 [inline]
bpf_get_stack_raw_tp+0x1a3/0x240 kernel/trace/bpf_trace.c:1984
0xffffffffa0001b6a
bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
__bpf_prog_run include/linux/filter.h:682 [inline]
bpf_prog_run include/linux/filter.h:698 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline]
bpf_trace_run2+0x47d/0x540 kernel/trace/bpf_trace.c:2444
trace_tlb_flush+0x118/0x140 include/trace/events/tlb.h:38
switch_mm_irqs_off+0x7cb/0xae0
context_switch kernel/sched/core.c:5392 [inline]
__schedule+0x1066/0x4a50 kernel/sched/core.c:6745
preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6924
preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6948
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
__text_poke+0xa6b/0xd30 arch/x86/kernel/alternative.c:1944
text_poke arch/x86/kernel/alternative.c:1968 [inline]
text_poke_bp_batch+0x265/0xb30 arch/x86/kernel/alternative.c:2276
text_poke_flush arch/x86/kernel/alternative.c:2470 [inline]
text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2477
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:205
static_key_enable+0x1a/0x20 kernel/jump_label.c:218
tracepoint_add_func+0x953/0x9e0 kernel/tracepoint.c:361
tracepoint_probe_register_prio kernel/tracepoint.c:511 [inline]
tracepoint_probe_register+0x105/0x160 kernel/tracepoint.c:531
perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline]
perf_trace_event_init+0x478/0x910 kernel/trace/trace_event_perf.c:202
perf_trace_init+0x243/0x2e0 kernel/trace/trace_event_perf.c:226
perf_tp_event_init+0x8d/0x110 kernel/events/core.c:10210
perf_try_init_event+0x139/0x3f0 kernel/events/core.c:11685
perf_init_event kernel/events/core.c:11755 [inline]
perf_event_alloc+0x1018/0x20b0 kernel/events/core.c:12033
__do_sys_perf_event_open kernel/events/core.c:12540 [inline]
__se_sys_perf_event_open+0xb43/0x38d0 kernel/events/core.c:12431
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&rq->__lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
raw_spin_rq_lock kernel/sched/sched.h:1406 [inline]
rq_lock kernel/sched/sched.h:1702 [inline]
task_fork_fair+0x61/0x1e0 kernel/sched/fair.c:12709
sched_cgroup_fork+0x37c/0x410 kernel/sched/core.c:4844
copy_process+0x2217/0x3dc0 kernel/fork.c:2499
kernel_clone+0x226/0x8f0 kernel/fork.c:2797
user_mode_thread+0x132/0x1a0 kernel/fork.c:2875
rest_init+0x23/0x300 init/main.c:707
start_kernel+0x47a/0x500 init/main.c:1084
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:488
common_startup_64+0x13e/0x147
-> #0 (&p->pi_lock){-.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262
rcu_read_unlock_special+0x3db/0x550 kernel/rcu/tree_plugin.h:655
__rcu_read_unlock+0xa1/0x110 kernel/rcu/tree_plugin.h:426
__mmap_lock_do_trace_acquire_returned+0x1f9/0x630 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:166 [inline]
get_mmap_lock_carefully mm/memory.c:5628 [inline]
lock_mm_and_find_vma+0x213/0x2f0 mm/memory.c:5688
do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
handle_page_fault arch/x86/mm/fault.c:1475 [inline]
exc_page_fault+0x1a9/0x8a0 arch/x86/mm/fault.c:1533
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
fault_in_readable+0x165/0x2b0
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
generic_perform_write+0x220/0x640 mm/filemap.c:3964
ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299
ext4_file_write_iter+0x1de/0x1a10
call_write_iter include/linux/fs.h:2120 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa2d/0xc50 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&p->pi_lock --> &rq->__lock --> lock#10
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(lock#10);
lock(&rq->__lock);
lock(lock#10);
lock(&p->pi_lock);
*** DEADLOCK ***
5 locks held by syz-executor.0/8491:
#0: ffff888057b239c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191
#1: ffff88802f3aa420 (sb_writers#4){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2871 [inline]
#1: ffff88802f3aa420 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x227/0xc50 fs/read_write.c:586
#2: ffff88805e14ac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline]
#2: ffff88805e14ac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0x97/0x350 fs/ext4/file.c:294
#3: ffff88807b0b81a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#3: ffff88807b0b81a0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5628 [inline]
#3: ffff88807b0b81a0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5688
#4: ffff8880b9538828 (lock#10){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
#4: ffff8880b9538828 (lock#10){+.+.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x8f/0x630 mm/mmap_lock.c:237
stack backtrace:
CPU: 1 PID: 8491 Comm: syz-executor.0 Not tainted 6.9.0-syzkaller-08570-g95348e463eab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262
rcu_read_unlock_special+0x3db/0x550 kernel/rcu/tree_plugin.h:655
__rcu_read_unlock+0xa1/0x110 kernel/rcu/tree_plugin.h:426
__mmap_lock_do_trace_acquire_returned+0x1f9/0x630 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:166 [inline]
get_mmap_lock_carefully mm/memory.c:5628 [inline]
lock_mm_and_find_vma+0x213/0x2f0 mm/memory.c:5688
do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
handle_page_fault arch/x86/mm/fault.c:1475 [inline]
exc_page_fault+0x1a9/0x8a0 arch/x86/mm/fault.c:1533
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:fault_in_readable+0x165/0x2b0 mm/gup.c:2009
Code: b5 ff 4c 8d b3 ff 0f 00 00 48 89 d8 4d 01 e6 49 81 e6 00 f0 ff ff 49 39 c6 72 6b e8 85 80 b5 ff 4c 39 f3 74 6e 4c 89 64 24 10 <44> 8a 23 43 0f b6 04 2f 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10
RSP: 0018:ffffc90002e4f860 EFLAGS: 00050287
RAX: ffffffff81e0b14b RBX: 000000002008e000 RCX: 0000000000040000
RDX: ffffc90009789000 RSI: 00000000000311f0 RDI: 00000000000311f1
RBP: ffffc90002e4f918 R08: ffffffff81e0b0e8 R09: ffffffff84ad9419
R10: 0000000000000002 R11: ffff888022843c00 R12: 0000000000001000
R13: dffffc0000000000 R14: 000000002008f000 R15: 1ffff920005c9f14
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
generic_perform_write+0x220/0x640 mm/filemap.c:3964
ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299
ext4_file_write_iter+0x1de/0x1a10
call_write_iter include/linux/fs.h:2120 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa2d/0xc50 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd1f167cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd1f23c40c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd1f17abf80 RCX: 00007fd1f167cee9
RDX: 00000000fffffd26 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007fd1f16c949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd1f17abf80 R15: 00007ffdbacf9b68
</TASK>
----------------
Code disassembly (best guess):
0: b5 ff mov $0xff,%ch
2: 4c 8d b3 ff 0f 00 00 lea 0xfff(%rbx),%r14
9: 48 89 d8 mov %rbx,%rax
c: 4d 01 e6 add %r12,%r14
f: 49 81 e6 00 f0 ff ff and $0xfffffffffffff000,%r14
16: 49 39 c6 cmp %rax,%r14
19: 72 6b jb 0x86
1b: e8 85 80 b5 ff call 0xffb580a5
20: 4c 39 f3 cmp %r14,%rbx
23: 74 6e je 0x93
25: 4c 89 64 24 10 mov %r12,0x10(%rsp)
* 2a: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction
2d: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax
32: 84 c0 test %al,%al
34: 75 18 jne 0x4e
36: 44 88 64 24 40 mov %r12b,0x40(%rsp)
3b: 48 rex.W
3c: 81 .byte 0x81
3d: c3 ret
3e: 00 10 add %dl,(%rax)
---
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syzbot found the following issue on:
HEAD commit: 95348e463eab selftests/bpf: Add netkit test for pkt_type
git tree: bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=11646be0980000
kernel config: https://syzkaller.appspot.com/x/.config?x=17ffd15f654c98ba
dashboard link: https://syzkaller.appspot.com/bug?extid=4970d08867f5a5b0bb78
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/45aceeb3f8f5/disk-95348e46.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ff3ff3033939/vmlinux-95348e46.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fdfb9e139fb3/bzImage-95348e46.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4970d0...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
6.9.0-syzkaller-08570-g95348e463eab #0 Not tainted
------------------------------------------------------
syz-executor.0/8491 is trying to acquire lock:
ffff8880176f0a18 (&p->pi_lock){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
ffff8880176f0a18 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262
but task is already holding lock:
ffff8880b9538828 (lock#10){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
ffff8880b9538828 (lock#10){+.+.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x8f/0x630 mm/mmap_lock.c:237
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (lock#10){+.+.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
__mmap_lock_do_trace_acquire_returned+0xa8/0x630 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:166 [inline]
stack_map_get_build_id_offset+0x9b2/0x9d0 kernel/bpf/stackmap.c:141
__bpf_get_stack+0x4ad/0x5a0 kernel/bpf/stackmap.c:449
____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1994 [inline]
bpf_get_stack_raw_tp+0x1a3/0x240 kernel/trace/bpf_trace.c:1984
0xffffffffa0001b6a
bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
__bpf_prog_run include/linux/filter.h:682 [inline]
bpf_prog_run include/linux/filter.h:698 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline]
bpf_trace_run2+0x47d/0x540 kernel/trace/bpf_trace.c:2444
trace_tlb_flush+0x118/0x140 include/trace/events/tlb.h:38
switch_mm_irqs_off+0x7cb/0xae0
context_switch kernel/sched/core.c:5392 [inline]
__schedule+0x1066/0x4a50 kernel/sched/core.c:6745
preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6924
preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6948
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
__text_poke+0xa6b/0xd30 arch/x86/kernel/alternative.c:1944
text_poke arch/x86/kernel/alternative.c:1968 [inline]
text_poke_bp_batch+0x265/0xb30 arch/x86/kernel/alternative.c:2276
text_poke_flush arch/x86/kernel/alternative.c:2470 [inline]
text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2477
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:205
static_key_enable+0x1a/0x20 kernel/jump_label.c:218
tracepoint_add_func+0x953/0x9e0 kernel/tracepoint.c:361
tracepoint_probe_register_prio kernel/tracepoint.c:511 [inline]
tracepoint_probe_register+0x105/0x160 kernel/tracepoint.c:531
perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline]
perf_trace_event_init+0x478/0x910 kernel/trace/trace_event_perf.c:202
perf_trace_init+0x243/0x2e0 kernel/trace/trace_event_perf.c:226
perf_tp_event_init+0x8d/0x110 kernel/events/core.c:10210
perf_try_init_event+0x139/0x3f0 kernel/events/core.c:11685
perf_init_event kernel/events/core.c:11755 [inline]
perf_event_alloc+0x1018/0x20b0 kernel/events/core.c:12033
__do_sys_perf_event_open kernel/events/core.c:12540 [inline]
__se_sys_perf_event_open+0xb43/0x38d0 kernel/events/core.c:12431
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&rq->__lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
raw_spin_rq_lock kernel/sched/sched.h:1406 [inline]
rq_lock kernel/sched/sched.h:1702 [inline]
task_fork_fair+0x61/0x1e0 kernel/sched/fair.c:12709
sched_cgroup_fork+0x37c/0x410 kernel/sched/core.c:4844
copy_process+0x2217/0x3dc0 kernel/fork.c:2499
kernel_clone+0x226/0x8f0 kernel/fork.c:2797
user_mode_thread+0x132/0x1a0 kernel/fork.c:2875
rest_init+0x23/0x300 init/main.c:707
start_kernel+0x47a/0x500 init/main.c:1084
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:488
common_startup_64+0x13e/0x147
-> #0 (&p->pi_lock){-.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262
rcu_read_unlock_special+0x3db/0x550 kernel/rcu/tree_plugin.h:655
__rcu_read_unlock+0xa1/0x110 kernel/rcu/tree_plugin.h:426
__mmap_lock_do_trace_acquire_returned+0x1f9/0x630 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:166 [inline]
get_mmap_lock_carefully mm/memory.c:5628 [inline]
lock_mm_and_find_vma+0x213/0x2f0 mm/memory.c:5688
do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
handle_page_fault arch/x86/mm/fault.c:1475 [inline]
exc_page_fault+0x1a9/0x8a0 arch/x86/mm/fault.c:1533
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
fault_in_readable+0x165/0x2b0
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
generic_perform_write+0x220/0x640 mm/filemap.c:3964
ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299
ext4_file_write_iter+0x1de/0x1a10
call_write_iter include/linux/fs.h:2120 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa2d/0xc50 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&p->pi_lock --> &rq->__lock --> lock#10
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(lock#10);
lock(&rq->__lock);
lock(lock#10);
lock(&p->pi_lock);
*** DEADLOCK ***
5 locks held by syz-executor.0/8491:
#0: ffff888057b239c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191
#1: ffff88802f3aa420 (sb_writers#4){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2871 [inline]
#1: ffff88802f3aa420 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x227/0xc50 fs/read_write.c:586
#2: ffff88805e14ac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline]
#2: ffff88805e14ac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0x97/0x350 fs/ext4/file.c:294
#3: ffff88807b0b81a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#3: ffff88807b0b81a0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5628 [inline]
#3: ffff88807b0b81a0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5688
#4: ffff8880b9538828 (lock#10){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
#4: ffff8880b9538828 (lock#10){+.+.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x8f/0x630 mm/mmap_lock.c:237
stack backtrace:
CPU: 1 PID: 8491 Comm: syz-executor.0 Not tainted 6.9.0-syzkaller-08570-g95348e463eab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262
rcu_read_unlock_special+0x3db/0x550 kernel/rcu/tree_plugin.h:655
__rcu_read_unlock+0xa1/0x110 kernel/rcu/tree_plugin.h:426
__mmap_lock_do_trace_acquire_returned+0x1f9/0x630 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:166 [inline]
get_mmap_lock_carefully mm/memory.c:5628 [inline]
lock_mm_and_find_vma+0x213/0x2f0 mm/memory.c:5688
do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
handle_page_fault arch/x86/mm/fault.c:1475 [inline]
exc_page_fault+0x1a9/0x8a0 arch/x86/mm/fault.c:1533
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:fault_in_readable+0x165/0x2b0 mm/gup.c:2009
Code: b5 ff 4c 8d b3 ff 0f 00 00 48 89 d8 4d 01 e6 49 81 e6 00 f0 ff ff 49 39 c6 72 6b e8 85 80 b5 ff 4c 39 f3 74 6e 4c 89 64 24 10 <44> 8a 23 43 0f b6 04 2f 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10
RSP: 0018:ffffc90002e4f860 EFLAGS: 00050287
RAX: ffffffff81e0b14b RBX: 000000002008e000 RCX: 0000000000040000
RDX: ffffc90009789000 RSI: 00000000000311f0 RDI: 00000000000311f1
RBP: ffffc90002e4f918 R08: ffffffff81e0b0e8 R09: ffffffff84ad9419
R10: 0000000000000002 R11: ffff888022843c00 R12: 0000000000001000
R13: dffffc0000000000 R14: 000000002008f000 R15: 1ffff920005c9f14
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
generic_perform_write+0x220/0x640 mm/filemap.c:3964
ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299
ext4_file_write_iter+0x1de/0x1a10
call_write_iter include/linux/fs.h:2120 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa2d/0xc50 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd1f167cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd1f23c40c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd1f17abf80 RCX: 00007fd1f167cee9
RDX: 00000000fffffd26 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007fd1f16c949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd1f17abf80 R15: 00007ffdbacf9b68
</TASK>
----------------
Code disassembly (best guess):
0: b5 ff mov $0xff,%ch
2: 4c 8d b3 ff 0f 00 00 lea 0xfff(%rbx),%r14
9: 48 89 d8 mov %rbx,%rax
c: 4d 01 e6 add %r12,%r14
f: 49 81 e6 00 f0 ff ff and $0xfffffffffffff000,%r14
16: 49 39 c6 cmp %rax,%r14
19: 72 6b jb 0x86
1b: e8 85 80 b5 ff call 0xffb580a5
20: 4c 39 f3 cmp %r14,%rbx
23: 74 6e je 0x93
25: 4c 89 64 24 10 mov %r12,0x10(%rsp)
* 2a: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction
2d: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax
32: 84 c0 test %al,%al
34: 75 18 jne 0x4e
36: 44 88 64 24 40 mov %r12b,0x40(%rsp)
3b: 48 rex.W
3c: 81 .byte 0x81
3d: c3 ret
3e: 00 10 add %dl,(%rax)
---
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