syzbot

RSP: 002b:00007fffbd9dcb98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7fda015fa0 RCX: 00007f7fd9d9aeb9
RDX: 0000000000000081 RSI: 00002000000002c0 RDI: 0000000000000003
RBP: 00007fffbd9dcc00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f7fda015fac R14: 00007f7fda015fa0 R15: 00007f7fda015fa0
 </TASK>
------------[ cut here ]------------
ret
WARNING: kernel/trace/blktrace.c:1330 at blk_register_tracepoints+0x33c/0x440 kernel/trace/blktrace.c:1330, CPU#0: syz.0.17/6030
Modules linked in:
CPU: 0 UID: 0 PID: 6030 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:blk_register_tracepoints+0x33c/0x440 kernel/trace/blktrace.c:1330
Code: 90 e8 38 d9 f9 ff 31 ff 89 c3 89 c6 e8 4d f1 f7 ff 85 db 0f 85 f9 00 00 00 e8 90 f6 f7 ff 5b c3 cc cc cc cc e8 85 f6 f7 ff 90 <0f> 0b 90 e9 ea fc ff ff e8 77 f6 f7 ff 90 0f 0b 90 e9 09 fd ff ff
RSP: 0018:ffffc90003bdfb30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000fffffff4 RCX: ffffffff820e5126
RDX: ffff88803377db80 RSI: ffffffff820e543b RDI: ffff88803377db80
RBP: 0000000000002000 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff4 R11: 0000000000000001 R12: ffff888026311c98
R13: 0000000000000000 R14: ffff888026311c98 R15: 0000000000000081
FS:  000055555c078500(0000) GS:ffff8881245e3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ff63fff CR3: 000000007375a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 get_probe_ref kernel/trace/blktrace.c:493 [inline]
 blk_trace_setup_queue+0x269/0x300 kernel/trace/blktrace.c:1897
 sysfs_blk_trace_attr_store+0x6e2/0xa20 kernel/trace/blktrace.c:2092
 dev_attr_store+0x58/0x80 drivers/base/core.c:2437
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142
 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:686
 ksys_write+0x12a/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7fd9d9aeb9
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:00007fffbd9dcb98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7fda015fa0 RCX: 00007f7fd9d9aeb9
RDX: 0000000000000081 RSI: 00002000000002c0 RDI: 0000000000000003
RBP: 00007fffbd9dcc00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f7fda015fac R14: 00007f7fda015fa0 R15: 00007f7fda015fa0
 </TASK>