Oops: general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7]
CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: loop0 loop_workfn
RIP: 0010:__queue_work+0xa4/0xf90 kernel/workqueue.c:2250
Code: 10 31 ff 89 ee e8 0c 2a 37 00 85 ed 0f 85 9d 0c 00 00 e8 bf 25 37 00 4d 8d b5 c0 01 00 00 4c 89 f0 48 c1 e8 03 48 89 44 24 30 <0f> b6 04 18 84 c0 0f 85 c4 0c 00 00 4c 89 34 24 41 8b 2e 89 ee 81
RSP: 0018:ffffc90000a08b88 EFLAGS: 00010002
RAX: 0000000000000038 RBX: dffffc0000000000 RCX: ffff888140ad1e80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88807e894347 R09: 1ffff1100fd12868
R10: dffffc0000000000 R11: ffffed100fd12869 R12: 0000000000000008
R13: 0000000000000000 R14: 00000000000001c0 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff888125fb9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff9ff5b42f8 CR3: 000000007555c000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 queue_work_on+0x181/0x270 kernel/workqueue.c:2386
 iomap_dio_bio_end_io+0xf4/0x1c0 fs/iomap/direct-io.c:222
 blk_update_request+0x57e/0xe60 block/blk-mq.c:1006
 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1168
 blk_complete_reqs block/blk-mq.c:1243 [inline]
 blk_done_softirq+0x10a/0x160 block/blk-mq.c:1248
 handle_softirqs+0x27d/0x880 kernel/softirq.c:626
 __do_softirq kernel/softirq.c:660 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:727
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:raise_softirq+0xcc/0x120 kernel/softirq.c:788
Code: 0d 44 00 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 49 41 f7 c4 00 02 00 00 74 01 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc90000ac7560 EFLAGS: 00000206
RAX: cacc1de7cd54e200 RBX: 0000000000000004 RCX: cacc1de7cd54e200
RDX: 0000000000000006 RSI: ffffffff8d78f926 RDI: ffffffff8bbf80e0
RBP: ffffc90000ac7610 R08: ffffffff8f7deb77 R09: 1ffffffff1efbd6e
R10: dffffc0000000000 R11: fffffbfff1efbd6f R12: 0000000000000a06
R13: 1ffff92000158ec8 R14: 1ffff92000158eac R15: dffffc0000000000
 blk_mq_raise_softirq block/blk-mq.c:1305 [inline]
 blk_mq_complete_request_remote+0x6f7/0xa50 block/blk-mq.c:1329
 blk_mq_complete_request+0x19/0xa0 block/blk-mq.c:1345
 do_req_filebacked drivers/block/loop.c:-1 [inline]
 loop_handle_cmd drivers/block/loop.c:2075 [inline]
 loop_process_work+0x81d/0x10e0 drivers/block/loop.c:2110
 process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
 process_scheduled_works kernel/workqueue.c:3344 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__queue_work+0xa4/0xf90 kernel/workqueue.c:2250
Code: 10 31 ff 89 ee e8 0c 2a 37 00 85 ed 0f 85 9d 0c 00 00 e8 bf 25 37 00 4d 8d b5 c0 01 00 00 4c 89 f0 48 c1 e8 03 48 89 44 24 30 <0f> b6 04 18 84 c0 0f 85 c4 0c 00 00 4c 89 34 24 41 8b 2e 89 ee 81
RSP: 0018:ffffc90000a08b88 EFLAGS: 00010002
RAX: 0000000000000038 RBX: dffffc0000000000 RCX: ffff888140ad1e80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88807e894347 R09: 1ffff1100fd12868
R10: dffffc0000000000 R11: ffffed100fd12869 R12: 0000000000000008
R13: 0000000000000000 R14: 00000000000001c0 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff888125fb9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff9ff5b42f8 CR3: 000000007555c000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	31 ff                	xor    %edi,%edi
   2:	89 ee                	mov    %ebp,%esi
   4:	e8 0c 2a 37 00       	call   0x372a15
   9:	85 ed                	test   %ebp,%ebp
   b:	0f 85 9d 0c 00 00    	jne    0xcae
  11:	e8 bf 25 37 00       	call   0x3725d5
  16:	4d 8d b5 c0 01 00 00 	lea    0x1c0(%r13),%r14
  1d:	4c 89 f0             	mov    %r14,%rax
  20:	48 c1 e8 03          	shr    $0x3,%rax
  24:	48 89 44 24 30       	mov    %rax,0x30(%rsp)
* 29:	0f b6 04 18          	movzbl (%rax,%rbx,1),%eax <-- trapping instruction
  2d:	84 c0                	test   %al,%al
  2f:	0f 85 c4 0c 00 00    	jne    0xcf9
  35:	4c 89 34 24          	mov    %r14,(%rsp)
  39:	41 8b 2e             	mov    (%r14),%ebp
  3c:	89 ee                	mov    %ebp,%esi
  3e:	81                   	.byte 0x81