WARNING in shmem_evict_inode
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sanan....@gmail.com
Jun 26, 2026, 5:28:03 PM (3 days ago) Jun 26
to hu...@google.com, baoli...@linux.alibaba.com, ak...@linux-foundation.org, linu...@kvack.org, linux-...@vger.kernel.org, syzk...@googlegroups.com, con...@pgazz.com
Good day, dear maintainers,
We found a bug using a modified version of syzkaller.
Kernel Branch: 7.0-rc1
Kernel Config: <https://drive.google.com/open?id=1XWXrj7ZUAS3GWmqvnny_U_mcxR6_AZCL>
Unfortunately, we don't have any reproducer for this bug yet.
Thank you!
Best regards,
Sanan Hasanov
------------[ cut here ]------------
inode->i_blocks
WARNING: mm/shmem.c:1430 at shmem_evict_inode+0x9d2/0xa30 mm/shmem.c:1430, CPU#0: syz.2.443/13891
Modules linked in:
CPU: 0 UID: 0 PID: 13891 Comm: syz.2.443 Not tainted 7.0.0-rc1 #1 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:shmem_evict_inode+0x9d2/0xa30 mm/shmem.c:1430
Code: 0e 48 3b 84 24 00 01 00 00 75 24 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 59 28 b8 ff e9 43 fe ff ff e8 4f 28 b8 ff 90 <0f> 0b 90 eb 9a e8 24 4f 16 09 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc9000b8ff680 EFLAGS: 00010293
RAX: ffffffff82056871 RBX: 0000000000000008 RCX: ffff88801b71d700
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffffc9000b8ff7d0 R08: ffffffff8da5a1a3 R09: 1ffffffff1b4b434
R10: dffffc0000000000 R11: fffffbfff1b4b435 R12: ffff88804b899ae8
R13: ffff88804b8999f0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30924220 CR3: 000000000d74a000 CR4: 00000000000006f0
Call Trace:
<TASK>
evict+0x5ed/0xad0 fs/inode.c:846
__dentry_kill+0x198/0x5d0 fs/dcache.c:670
finish_dput+0xc9/0x480 fs/dcache.c:879
__fput+0x688/0xa60 fs/file_table.c:477
task_work_run+0x1ce/0x250 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x694/0x22f0 kernel/exit.c:971
do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
get_signal+0x1280/0x1330 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x640 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x33b/0xfc0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7fd265fa3b6d
Code: Unable to access opcode bytes at 0x7fd265fa3b43.
RSP: 002b:00007fd266d8a0d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd266216188 RCX: 00007fd265fa3b6d
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd266216188
RBP: 00007fd266216180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd266216218 R14: 000000000000006e R15: 00007ffcd73a64f0
</TASK>
<<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>
Modules linked in:
CPU: 0 UID: 0 PID: 13891 Comm: syz.2.443 Not tainted 7.0.0-rc1 #1 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:shmem_evict_inode+0x9d2/0xa30
Code: 0e 48 3b 84 24 00 01 00 00 75 24 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 59 28 b8 ff e9 43 fe ff ff e8 4f 28 b8 ff 90 <0f> 0b 90 eb 9a e8 24 4f 16 09 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc9000b8ff680 EFLAGS: 00010293
RAX: ffffffff82056871 RBX: 0000000000000008 RCX: ffff88801b71d700
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffffc9000b8ff7d0 R08: ffffffff8da5a1a3 R09: 1ffffffff1b4b434
R10: dffffc0000000000 R11: fffffbfff1b4b435 R12: ffff88804b899ae8
R13: ffff88804b8999f0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30924220 CR3: 000000000d74a000 CR4: 00000000000006f0
Call Trace:
<TASK>
evict+0x5ed/0xad0
__dentry_kill+0x198/0x5d0
finish_dput+0xc9/0x480
__fput+0x688/0xa60
task_work_run+0x1ce/0x250
do_exit+0x694/0x22f0
do_group_exit+0x21c/0x2d0
get_signal+0x1280/0x1330
arch_do_signal_or_restart+0x9a/0x640
exit_to_user_mode_loop+0x87/0x4e0
do_syscall_64+0x33b/0xfc0
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7fd265fa3b6d
Code: Unable to access opcode bytes at 0x7fd265fa3b43.
RSP: 002b:00007fd266d8a0d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd266216188 RCX: 00007fd265fa3b6d
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd266216188
RBP: 00007fd266216180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd266216218 R14: 000000000000006e R15: 00007ffcd73a64f0
</TASK>
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 0 UID: 0 PID: 13891 Comm: syz.2.443 Not tainted 7.0.0-rc1 #1 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
vpanic+0x41f/0xa30
panic+0xb9/0xc0
__warn+0x317/0x500
__report_bug+0x28d/0x500
report_bug+0x16a/0x220
handle_bug+0x98/0x200
exc_invalid_op+0x1a/0x50
asm_exc_invalid_op+0x1a/0x20
RIP: 0010:shmem_evict_inode+0x9d2/0xa30
Code: 0e 48 3b 84 24 00 01 00 00 75 24 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 59 28 b8 ff e9 43 fe ff ff e8 4f 28 b8 ff 90 <0f> 0b 90 eb 9a e8 24 4f 16 09 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc9000b8ff680 EFLAGS: 00010293
RAX: ffffffff82056871 RBX: 0000000000000008 RCX: ffff88801b71d700
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffffc9000b8ff7d0 R08: ffffffff8da5a1a3 R09: 1ffffffff1b4b434
R10: dffffc0000000000 R11: fffffbfff1b4b435 R12: ffff88804b899ae8
R13: ffff88804b8999f0 R14: 0000000000000000 R15: 0000000000000000
evict+0x5ed/0xad0
__dentry_kill+0x198/0x5d0
finish_dput+0xc9/0x480
__fput+0x688/0xa60
task_work_run+0x1ce/0x250
do_exit+0x694/0x22f0
do_group_exit+0x21c/0x2d0
get_signal+0x1280/0x1330
arch_do_signal_or_restart+0x9a/0x640
exit_to_user_mode_loop+0x87/0x4e0
do_syscall_64+0x33b/0xfc0
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7fd265fa3b6d
Code: Unable to access opcode bytes at 0x7fd265fa3b43.
RSP: 002b:00007fd266d8a0d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd266216188 RCX: 00007fd265fa3b6d
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd266216188
RBP: 00007fd266216180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd266216218 R14: 000000000000006e R15: 00007ffcd73a64f0
</TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..
<<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>
We found a bug using a modified version of syzkaller.
Kernel Branch: 7.0-rc1
Kernel Config: <https://drive.google.com/open?id=1XWXrj7ZUAS3GWmqvnny_U_mcxR6_AZCL>
Unfortunately, we don't have any reproducer for this bug yet.
Thank you!
Best regards,
Sanan Hasanov
------------[ cut here ]------------
inode->i_blocks
WARNING: mm/shmem.c:1430 at shmem_evict_inode+0x9d2/0xa30 mm/shmem.c:1430, CPU#0: syz.2.443/13891
Modules linked in:
CPU: 0 UID: 0 PID: 13891 Comm: syz.2.443 Not tainted 7.0.0-rc1 #1 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:shmem_evict_inode+0x9d2/0xa30 mm/shmem.c:1430
Code: 0e 48 3b 84 24 00 01 00 00 75 24 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 59 28 b8 ff e9 43 fe ff ff e8 4f 28 b8 ff 90 <0f> 0b 90 eb 9a e8 24 4f 16 09 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc9000b8ff680 EFLAGS: 00010293
RAX: ffffffff82056871 RBX: 0000000000000008 RCX: ffff88801b71d700
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffffc9000b8ff7d0 R08: ffffffff8da5a1a3 R09: 1ffffffff1b4b434
R10: dffffc0000000000 R11: fffffbfff1b4b435 R12: ffff88804b899ae8
R13: ffff88804b8999f0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30924220 CR3: 000000000d74a000 CR4: 00000000000006f0
Call Trace:
<TASK>
evict+0x5ed/0xad0 fs/inode.c:846
__dentry_kill+0x198/0x5d0 fs/dcache.c:670
finish_dput+0xc9/0x480 fs/dcache.c:879
__fput+0x688/0xa60 fs/file_table.c:477
task_work_run+0x1ce/0x250 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x694/0x22f0 kernel/exit.c:971
do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
get_signal+0x1280/0x1330 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x640 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x33b/0xfc0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7fd265fa3b6d
Code: Unable to access opcode bytes at 0x7fd265fa3b43.
RSP: 002b:00007fd266d8a0d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd266216188 RCX: 00007fd265fa3b6d
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd266216188
RBP: 00007fd266216180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd266216218 R14: 000000000000006e R15: 00007ffcd73a64f0
</TASK>
<<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>
Modules linked in:
CPU: 0 UID: 0 PID: 13891 Comm: syz.2.443 Not tainted 7.0.0-rc1 #1 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:shmem_evict_inode+0x9d2/0xa30
Code: 0e 48 3b 84 24 00 01 00 00 75 24 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 59 28 b8 ff e9 43 fe ff ff e8 4f 28 b8 ff 90 <0f> 0b 90 eb 9a e8 24 4f 16 09 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc9000b8ff680 EFLAGS: 00010293
RAX: ffffffff82056871 RBX: 0000000000000008 RCX: ffff88801b71d700
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffffc9000b8ff7d0 R08: ffffffff8da5a1a3 R09: 1ffffffff1b4b434
R10: dffffc0000000000 R11: fffffbfff1b4b435 R12: ffff88804b899ae8
R13: ffff88804b8999f0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30924220 CR3: 000000000d74a000 CR4: 00000000000006f0
Call Trace:
<TASK>
evict+0x5ed/0xad0
__dentry_kill+0x198/0x5d0
finish_dput+0xc9/0x480
__fput+0x688/0xa60
task_work_run+0x1ce/0x250
do_exit+0x694/0x22f0
do_group_exit+0x21c/0x2d0
get_signal+0x1280/0x1330
arch_do_signal_or_restart+0x9a/0x640
exit_to_user_mode_loop+0x87/0x4e0
do_syscall_64+0x33b/0xfc0
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7fd265fa3b6d
Code: Unable to access opcode bytes at 0x7fd265fa3b43.
RSP: 002b:00007fd266d8a0d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd266216188 RCX: 00007fd265fa3b6d
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd266216188
RBP: 00007fd266216180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd266216218 R14: 000000000000006e R15: 00007ffcd73a64f0
</TASK>
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 0 UID: 0 PID: 13891 Comm: syz.2.443 Not tainted 7.0.0-rc1 #1 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
vpanic+0x41f/0xa30
panic+0xb9/0xc0
__warn+0x317/0x500
__report_bug+0x28d/0x500
report_bug+0x16a/0x220
handle_bug+0x98/0x200
exc_invalid_op+0x1a/0x50
asm_exc_invalid_op+0x1a/0x20
RIP: 0010:shmem_evict_inode+0x9d2/0xa30
Code: 0e 48 3b 84 24 00 01 00 00 75 24 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 59 28 b8 ff e9 43 fe ff ff e8 4f 28 b8 ff 90 <0f> 0b 90 eb 9a e8 24 4f 16 09 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc9000b8ff680 EFLAGS: 00010293
RAX: ffffffff82056871 RBX: 0000000000000008 RCX: ffff88801b71d700
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffffc9000b8ff7d0 R08: ffffffff8da5a1a3 R09: 1ffffffff1b4b434
R10: dffffc0000000000 R11: fffffbfff1b4b435 R12: ffff88804b899ae8
R13: ffff88804b8999f0 R14: 0000000000000000 R15: 0000000000000000
evict+0x5ed/0xad0
__dentry_kill+0x198/0x5d0
finish_dput+0xc9/0x480
__fput+0x688/0xa60
task_work_run+0x1ce/0x250
do_exit+0x694/0x22f0
do_group_exit+0x21c/0x2d0
get_signal+0x1280/0x1330
arch_do_signal_or_restart+0x9a/0x640
exit_to_user_mode_loop+0x87/0x4e0
do_syscall_64+0x33b/0xfc0
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7fd265fa3b6d
Code: Unable to access opcode bytes at 0x7fd265fa3b43.
RSP: 002b:00007fd266d8a0d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd266216188 RCX: 00007fd265fa3b6d
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd266216188
RBP: 00007fd266216180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd266216218 R14: 000000000000006e R15: 00007ffcd73a64f0
</TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..
<<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>
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