Hello,
syzbot found the following issue on:
HEAD commit: bbed346d5a96 Merge branch 'for-next/core' into for-kernelci
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=13b44c16880000
kernel config:
https://syzkaller.appspot.com/x/.config?x=3a4a45d2d827c1e
dashboard link:
https://syzkaller.appspot.com/bug?extid=ce1d8c2d8ff5b6760687
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
CC: [
ak...@linux-foundation.org cgr...@vger.kernel.org han...@cmpxchg.org linux-...@vger.kernel.org linu...@kvack.org mho...@kernel.org roman.g...@linux.dev shak...@google.com songm...@bytedance.com]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/e8e91bc79312/disk-bbed346d.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/c1cb3fb3b77e/vmlinux-bbed346d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+ce1d8c...@syzkaller.appspotmail.com
Unable to handle kernel paging request at virtual address ffff00013569b309
Mem abort info:
ESR = 0x0000000096000021
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x21: alignment fault
Data abort info:
ISV = 0, ISS = 0x00000021
CM = 0, WnR = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001c566b000
[ffff00013569b309] pgd=180000023fff8003, p4d=180000023fff8003, pud=180000023f7f3003, pmd=180000023f647003, pte=006800017569b707
Internal error: Oops: 0000000096000021 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 20 Comm: ksoftirqd/1 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 004000c5 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __lse_atomic64_add arch/arm64/include/asm/atomic_lse.h:134 [inline]
pc : arch_atomic64_add arch/arm64/include/asm/atomic.h:67 [inline]
pc : arch_atomic_long_add include/linux/atomic/atomic-long.h:53 [inline]
pc : atomic_long_add include/linux/atomic/atomic-instrumented.h:1295 [inline]
pc : percpu_ref_get_many+0x11c/0x140 include/linux/percpu-refcount.h:207
lr : rcu_read_lock include/linux/rcupdate.h:707 [inline]
lr : percpu_ref_get_many+0x2c/0x140 include/linux/percpu-refcount.h:202
sp : ffff80000f263b00
x29: ffff80000f263b00 x28: 0000000000000005 x27: 00000000fffffff8
x26: ffff80000d26e520 x25: ffff80000d30cf28 x24: 0000000000000000
x23: ffff0001fefeb520 x22: 0000000000000001 x21: ffff000110745280
x20: ffff0001107abb00 x19: 0000000000000001 x18: 0000000000000371
x17: ffff80000bffd6bc x16: ffff80000db49158 x15: ffff0000c02f0000
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c02f0000
x11: ff808000095d19c0 x10: 0000000000000000 x9 : 738e439a0775eb06
x8 : ffff00013569b309
x7 : ffff80000856806c
x6 : 0000000000000000
x5 : 0000000000000080
x4 : 0000000000000000
x3 : 0000000000000002
x2 : 0000000000000008
x1 : ffff80000ce26a9f
x0 : 0000000000000001
Call trace:
alternative_has_feature_likely arch/arm64/include/asm/alternative-macros.h:232 [inline]
system_uses_lse_atomics arch/arm64/include/asm/lse.h:22 [inline]
arch_atomic64_add arch/arm64/include/asm/atomic.h:67 [inline]
arch_atomic_long_add include/linux/atomic/atomic-long.h:53 [inline]
atomic_long_add include/linux/atomic/atomic-instrumented.h:1295 [inline]
percpu_ref_get_many+0x11c/0x140 include/linux/percpu-refcount.h:207
percpu_ref_get include/linux/percpu-refcount.h:222 [inline]
obj_cgroup_get include/linux/memcontrol.h:801 [inline]
refill_obj_stock+0x8c/0x254 mm/memcontrol.c:3272
obj_cgroup_uncharge+0x14/0x20 mm/memcontrol.c:3339
memcg_slab_free_hook+0x118/0x188 mm/slab.h:564
slab_free mm/slub.c:3534 [inline]
kmem_cache_free+0xd8/0x3a4 mm/slub.c:3556
file_free_rcu+0x80/0xfc fs/file_table.c:51
rcu_do_batch+0x19c/0x57c kernel/rcu/tree.c:2245
rcu_core+0x2b0/0x59c kernel/rcu/tree.c:2505
rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2522
_stext+0x168/0x37c
run_ksoftirqd+0x4c/0x21c kernel/softirq.c:934
smpboot_thread_fn+0x248/0x3e4 kernel/smpboot.c:164
kthread+0x12c/0x158 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
Code: 94e961c8 17ffffe8 f9400688 d503201f (f833011f)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 94e961c8 bl 0x3a58720
4: 17ffffe8 b 0xffffffffffffffa4
8: f9400688 ldr x8, [x20, #8]
c: d503201f nop
* 10: f833011f stadd x19, [x8] <-- trapping instruction
---
This report is generated by a bot. It may contain errors.
See
https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at
syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.