general protection fault, probably for non-canonical address 0xdffffc0000000032: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197]
CPU: 1 PID: 1134 Comm: kworker/u4:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: loop0 loop_workfn
RIP: 0010:file_inode include/linux/fs.h:1075 [inline]
RIP: 0010:file_start_write include/linux/fs.h:2709 [inline]
RIP: 0010:lo_write_bvec drivers/block/loop.c:243 [inline]
RIP: 0010:lo_write_simple drivers/block/loop.c:266 [inline]
RIP: 0010:do_req_filebacked drivers/block/loop.c:490 [inline]
RIP: 0010:loop_handle_cmd drivers/block/loop.c:1933 [inline]
RIP: 0010:loop_process_work+0xee0/0x1ed0 drivers/block/loop.c:1968
Code: be 01 00 00 00 48 8d 94 24 00 02 00 00 e8 28 af db fe 4d 8d a7 90 01 00 00 4d 89 e5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 80 7c 05 00 00 74 08 4c 89 e7 e8 70 3a 9b fc 49 8b 1c 24 48 89
RSP: 0018:ffffc9000455f940 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000001000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000455fae8
RBP: ffffc9000455fbb0 R08: 0000000000000004 R09: 0000000000000004
R10: ffffc9000455fad4 R11: fffff520008abf5c R12: 0000000000000190
R13: 0000000000000032 R14: ffffc9000455fad0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556a896588 CR3: 000000001bb10000 CR4: 00000000003506e0
Call Trace:
<TASK>
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:file_inode include/linux/fs.h:1075 [inline]
RIP: 0010:file_start_write include/linux/fs.h:2709 [inline]
RIP: 0010:lo_write_bvec drivers/block/loop.c:243 [inline]
RIP: 0010:lo_write_simple drivers/block/loop.c:266 [inline]
RIP: 0010:do_req_filebacked drivers/block/loop.c:490 [inline]
RIP: 0010:loop_handle_cmd drivers/block/loop.c:1933 [inline]
RIP: 0010:loop_process_work+0xee0/0x1ed0 drivers/block/loop.c:1968
Code: be 01 00 00 00 48 8d 94 24 00 02 00 00 e8 28 af db fe 4d 8d a7 90 01 00 00 4d 89 e5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 80 7c 05 00 00 74 08 4c 89 e7 e8 70 3a 9b fc 49 8b 1c 24 48 89
RSP: 0018:ffffc9000455f940 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000001000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000455fae8
RBP: ffffc9000455fbb0 R08: 0000000000000004 R09: 0000000000000004
R10: ffffc9000455fad4 R11: fffff520008abf5c R12: 0000000000000190
R13: 0000000000000032 R14: ffffc9000455fad0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f07f4ef0000 CR3: 0000000023df6000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
0: be 01 00 00 00 mov $0x1,%esi
5: 48 8d 94 24 00 02 00 lea 0x200(%rsp),%rdx
c: 00
d: e8 28 af db fe call 0xfedbaf3a
12: 4d 8d a7 90 01 00 00 lea 0x190(%r15),%r12
19: 4d 89 e5 mov %r12,%r13
1c: 49 c1 ed 03 shr $0x3,%r13
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 41 80 7c 05 00 00 cmpb $0x0,0x0(%r13,%rax,1) <-- trapping instruction
30: 74 08 je 0x3a
32: 4c 89 e7 mov %r12,%rdi
35: e8 70 3a 9b fc call 0xfc9b3aaa
3a: 49 8b 1c 24 mov (%r12),%rbx
3e: 48 rex.W
3f: 89 .byte 0x89