loop0: detected capacity change from 0 to 32768
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000039: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000001c8-0x00000000000001cf]
CPU: 0 UID: 0 PID: 5355 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:do_perf_trace_error_throw fs/bcachefs/trace.h:204 [inline]
RIP: 0010:perf_trace_error_throw+0x248/0x480 fs/bcachefs/trace.h:204
Code: e8 dd 3d c6 fd 49 c7 04 24 00 00 00 00 48 8b 5c 24 38 48 81 c3 c8 01 00 00 48 89 d8 48 c1 e8 03 49 bc 00 00 00 00 00 fc ff df <42> 0f b6 04 20 84 c0 0f 85 90 01 00 00 8b 1b 49 8d 7e 08 48 89 f8
RSP: 0018:ffffc9000d477540 EFLAGS: 00010206
RAX: 0000000000000039 RBX: 00000000000001c8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801fc32a08
RBP: ffffc9000d477638 R08: 0000000000000004 R09: 0000000000000004
R10: ffffe8ffffc489cc R11: fffff91ffff8913b R12: dffffc0000000000
R13: ffffe8ffffc39c60 R14: ffffe8ffffc48980 R15: 1ffff92001a8eeb0
FS:  00007f8e6672a6c0(0000) GS:ffff88808d20f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffcbded808 CR3: 0000000033b09000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __do_trace_error_throw fs/bcachefs/trace.h:204 [inline]
 trace_error_throw fs/bcachefs/trace.h:204 [inline]
 __bch2_err_trace+0x1ae/0x210 fs/bcachefs/bcachefs.h:409
 bch2_fs_open+0x12a8/0x2600 fs/bcachefs/super.c:2409
 bch2_fs_get_tree+0x44f/0x1520 fs/bcachefs/fs.c:2472
 vfs_get_tree+0x92/0x2b0 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e6599038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8e66729e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f8e66729ef0 RCX: 00007f8e6599038a
RDX: 00002000000000c0 RSI: 0000200000000080 RDI: 00007f8e66729eb0
RBP: 00002000000000c0 R08: 00007f8e66729ef0 R09: 0000000000200000
R10: 0000000000200000 R11: 0000000000000246 R12: 0000200000000080
R13: 00007f8e66729eb0 R14: 00000000000059a8 R15: 0000200000000600
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:do_perf_trace_error_throw fs/bcachefs/trace.h:204 [inline]
RIP: 0010:perf_trace_error_throw+0x248/0x480 fs/bcachefs/trace.h:204
Code: e8 dd 3d c6 fd 49 c7 04 24 00 00 00 00 48 8b 5c 24 38 48 81 c3 c8 01 00 00 48 89 d8 48 c1 e8 03 49 bc 00 00 00 00 00 fc ff df <42> 0f b6 04 20 84 c0 0f 85 90 01 00 00 8b 1b 49 8d 7e 08 48 89 f8
RSP: 0018:ffffc9000d477540 EFLAGS: 00010206
RAX: 0000000000000039 RBX: 00000000000001c8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801fc32a08
RBP: ffffc9000d477638 R08: 0000000000000004 R09: 0000000000000004
R10: ffffe8ffffc489cc R11: fffff91ffff8913b R12: dffffc0000000000
R13: ffffe8ffffc39c60 R14: ffffe8ffffc48980 R15: 1ffff92001a8eeb0
FS:  00007f8e6672a6c0(0000) GS:ffff88808d20f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffcbded808 CR3: 0000000033b09000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	e8 dd 3d c6 fd       	call   0xfdc63de2
   5:	49 c7 04 24 00 00 00 	movq   $0x0,(%r12)
   c:	00
   d:	48 8b 5c 24 38       	mov    0x38(%rsp),%rbx
  12:	48 81 c3 c8 01 00 00 	add    $0x1c8,%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  27:	fc ff df
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 90 01 00 00    	jne    0x1c7
  37:	8b 1b                	mov    (%rbx),%ebx
  39:	49 8d 7e 08          	lea    0x8(%r14),%rdi
  3d:	48 89 f8             	mov    %rdi,%rax