loop0: detected capacity change from 0 to 32768
BTRFS: device fsid 395ef67a-297e-477c-816d-cd80a5b93e5d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5330)
BTRFS info (device loop0): first mount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d
BTRFS info (device loop0): using sha256 checksum algorithm
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): turning on async discard
BTRFS info (device loop0): enabling free space tree
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 0 UID: 0 PID: 5330 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 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:73 [inline]
 should_fail_ex+0x412/0x560 lib/fault-inject.c:174
 should_failslab+0xa8/0x100 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4491 [inline]
 slab_alloc_node mm/slub.c:4843 [inline]
 __do_kmalloc_node mm/slub.c:5259 [inline]
 __kmalloc_noprof+0xe8/0x760 mm/slub.c:5272
 kmalloc_noprof include/linux/slab.h:954 [inline]
 allocate_probes kernel/tracepoint.c:106 [inline]
 func_add kernel/tracepoint.c:168 [inline]
 tracepoint_add_func+0x366/0xa50 kernel/tracepoint.c:301
 tracepoint_probe_register_prio kernel/tracepoint.c:473 [inline]
 tracepoint_probe_register+0x5d/0x90 kernel/tracepoint.c:493
 register_trace_block_rq_insert include/trace/events/block.h:238 [inline]
 blk_register_tracepoints kernel/trace/blktrace.c:1331 [inline]
 get_probe_ref+0x4f/0x470 kernel/trace/blktrace.c:492
 blk_trace_setup+0x377/0x520 kernel/trace/blktrace.c:795
 sg_ioctl_common drivers/scsi/sg.c:1116 [inline]
 sg_ioctl+0xa93/0x2220 drivers/scsi/sg.c:1158
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d2e79c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3d2f59efe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3d2ea15fa0 RCX: 00007f3d2e79c799
RDX: 0000200000000540 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f3d2f59f050 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f3d2ea16038 R14: 00007f3d2ea15fa0 R15: 00007fff5fa8b868
 </TASK>
------------[ cut here ]------------
ret
WARNING: kernel/trace/blktrace.c:1332 at blk_register_tracepoints kernel/trace/blktrace.c:1332 [inline], CPU#0: syz.0.0/5330
WARNING: kernel/trace/blktrace.c:1332 at get_probe_ref+0x377/0x470 kernel/trace/blktrace.c:492, CPU#0: syz.0.0/5330
Modules linked in:
CPU: 0 UID: 0 PID: 5330 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 04/01/2014
RIP: 0010:blk_register_tracepoints kernel/trace/blktrace.c:1332 [inline]
RIP: 0010:get_probe_ref+0x377/0x470 kernel/trace/blktrace.c:492
Code: c3 31 ff 89 c6 e8 19 92 f7 ff 85 db 0f 85 00 01 00 00 e8 cc 8d f7 ff 48 c7 c7 e0 ca 7c 8e 5b e9 af 04 e4 09 e8 ba 8d f7 ff 90 <0f> 0b 90 e9 e8 fc ff ff e8 ac 8d f7 ff 90 0f 0b 90 e9 07 fd ff ff
RSP: 0018:ffffc9000de57af0 EFLAGS: 00010293
RAX: ffffffff81ce2416 RBX: 00000000fffffff4 RCX: ffff88801ab94980
RDX: 0000000000000000 RSI: 00000000fffffff4 RDI: 0000000000000000
RBP: ffffc9000de57d30 R08: ffffc9000de57a27 R09: 1ffff92001bcaf44
R10: dffffc0000000000 R11: fffff52001bcaf45 R12: 1ffff92001bcaf68
R13: 0000000000400140 R14: dffffc0000000000 R15: ffff88801fba7260
FS:  00007f3d2f59f6c0(0000) GS:ffff88808ca51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3d2e8de420 CR3: 000000001a947000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000000000d0602
Call Trace:
 <TASK>
 blk_trace_setup+0x377/0x520 kernel/trace/blktrace.c:795
 sg_ioctl_common drivers/scsi/sg.c:1116 [inline]
 sg_ioctl+0xa93/0x2220 drivers/scsi/sg.c:1158
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d2e79c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3d2f59efe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3d2ea15fa0 RCX: 00007f3d2e79c799
RDX: 0000200000000540 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f3d2f59f050 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f3d2ea16038 R14: 00007f3d2ea15fa0 R15: 00007fff5fa8b868
 </TASK>