page: ffffea0001587850: ffffea00017c70c8 0000000000000000
page: ffffea0001587860: 000000000000001c ffff88802fecae88
page: ffffea0001587870: 00000001ffffffff ffff88807fde4000
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 6060 Comm: syz-executor Not tainted 6.12.0-rc5-syzkaller-00005-ge42b1a9a2557 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:diSync+0x13a/0x840 fs/jfs/jfs_imap.c:226
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 51 06 00 00 48 8b 04 24 48 89 ea 48 c1 ea 03 48 8b 58 30 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e e9 06 00 00 48 89 da 44 8b 65
RSP: 0018:ffffc90002d2fb98 EFLAGS: 00010256
RAX: dffffc0000000000 RBX: ffff88805f1c3000 RCX: ffffffff83113ff1
RDX: 0000000000000000 RSI: ffffffff830d8f2e RDI: ffff88802793f6f8
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000002 R11: 0000000000000000 R12: ffff88805dd03b00
R13: 0000000000000000 R14: ffff88805dd03b80 R15: ffff888024dc2c28
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd40144528 CR3: 0000000069dca000 CR4: 0000000000350ef0
Call Trace:
<TASK>
diUnmount+0xc8/0x160 fs/jfs/jfs_imap.c:185
jfs_umount+0x18a/0x440 fs/jfs/jfs_umount.c:63
jfs_put_super+0x88/0x1d0 fs/jfs/super.c:194
generic_shutdown_super+0x15f/0x3d0 fs/super.c:642
kill_block_super+0x3b/0x90 fs/super.c:1696
deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
deactivate_super+0xde/0x100 fs/super.c:506
cleanup_mnt+0x222/0x450 fs/namespace.c:1373
task_work_run+0x151/0x250 kernel/task_work.c:239
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0xadd/0x2d70 kernel/exit.c:939
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ca9f7e719
Code: Unable to access opcode bytes at 0x7f6ca9f7e6ef.
RSP: 002b:00007ffef4f3a538 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f6ca9ff11f1 RCX: 00007f6ca9f7e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000002 R08: 00007ffef4f382d7 R09: 00007ffef4f3b7f0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffef4f3b7f0
R13: 00007f6ca9ff11cc R14: 00000000000257b4 R15: 00007ffef4f3c8b0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:diSync+0x13a/0x840 fs/jfs/jfs_imap.c:226
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 51 06 00 00 48 8b 04 24 48 89 ea 48 c1 ea 03 48 8b 58 30 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e e9 06 00 00 48 89 da 44 8b 65
RSP: 0018:ffffc90002d2fb98 EFLAGS: 00010256
RAX: dffffc0000000000 RBX: ffff88805f1c3000 RCX: ffffffff83113ff1
RDX: 0000000000000000 RSI: ffffffff830d8f2e RDI: ffff88802793f6f8
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000002 R11: 0000000000000000 R12: ffff88805dd03b00
R13: 0000000000000000 R14: ffff88805dd03b80 R15: ffff888024dc2c28
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd40144528 CR3: 0000000069dca000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: 48 89 fa mov %rdi,%rdx
3: 48 c1 ea 03 shr $0x3,%rdx
7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
b: 0f 85 51 06 00 00 jne 0x662
11: 48 8b 04 24 mov (%rsp),%rax
15: 48 89 ea mov %rbp,%rdx
18: 48 c1 ea 03 shr $0x3,%rdx
1c: 48 8b 58 30 mov 0x30(%rax),%rbx
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 74 08 je 0x3a
32: 3c 03 cmp $0x3,%al
34: 0f 8e e9 06 00 00 jle 0x723
3a: 48 89 da mov %rbx,%rdx
3d: 44 rex.R
3e: 8b .byte 0x8b
3f: 65 gs