general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 5.19.0-syzkaller-00428-g9de1f9c8ca51 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:relay_switch_subbuf+0x20e/0x900 kernel/relay.c:676
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 3d 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6d 68 49 8d 7d 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 7a 06 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b
RSP: 0018:ffffc900001b7ad8 EFLAGS: 00010016
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100
RDX: 000000000000000a RSI: ffffffff817b59e6 RDI: 0000000000000050
RBP: ffff88802d29b1a0 R08: 0000000000000006 R09: 0000000000000040
R10: 0000000000000044 R11: 0000000000000001 R12: 0000000000000040
R13: 0000000000000000 R14: ffff88801ed98200 R15: 0000000000000040
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 000000007e06f000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 relay_reserve include/linux/relay.h:248 [inline]
 trace_note+0x5af/0x720 kernel/trace/blktrace.c:95
 trace_note_tsk kernel/trace/blktrace.c:126 [inline]
 __blk_add_trace+0xbfb/0xdf0 kernel/trace/blktrace.c:267
 blk_add_trace_rq+0x392/0x490 kernel/trace/blktrace.c:845
 trace_block_rq_complete include/trace/events/block.h:147 [inline]
 blk_update_request+0x924/0x1310 block/blk-mq.c:788
 blk_mq_end_request+0x4b/0x80 block/blk-mq.c:944
 lo_complete_rq+0x1c2/0x280 drivers/block/loop.c:370
 blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1015
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571
 run_ksoftirqd kernel/softirq.c:934 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:926
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:relay_switch_subbuf+0x20e/0x900 kernel/relay.c:676
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 3d 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6d 68 49 8d 7d 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 7a 06 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b
RSP: 0018:ffffc900001b7ad8 EFLAGS: 00010016
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100
RDX: 000000000000000a RSI: ffffffff817b59e6 RDI: 0000000000000050
RBP: ffff88802d29b1a0 R08: 0000000000000006 R09: 0000000000000040
R10: 0000000000000044 R11: 0000000000000001 R12: 0000000000000040
R13: 0000000000000000 R14: ffff88801ed98200 R15: 0000000000000040
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 000000007e06f000 CR4: 0000000000350ee0
----------------
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 3d 06 00 00    	jne    0x64e
  11:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  18:	fc ff df
  1b:	4c 8b 6d 68          	mov    0x68(%rbp),%r13
  1f:	49 8d 7d 50          	lea    0x50(%r13),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 7a 06 00 00    	jne    0x6ae
  34:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  3b:	fc ff df
  3e:	49                   	rex.WB
  3f:	8b                   	.byte 0x8b