bisecting fixing commit since 8034e99d1a010a795b979582c0b2370584d8abf4
building syzkaller on 8b9ca619df135211a89cc19719f2705d0016045d
testing commit 8034e99d1a010a795b979582c0b2370584d8abf4
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: a7fa68295ce5e1ae8e83fecc7ca1967058563d331e09f9fbcb9f84c81dbc8696
run #0: crashed: WARNING in get_probe_ref
run #1: crashed: WARNING in get_probe_ref
run #2: crashed: WARNING in get_probe_ref
run #3: crashed: WARNING in get_probe_ref
run #4: crashed: WARNING in get_probe_ref
run #5: crashed: WARNING in get_probe_ref
run #6: crashed: WARNING in get_probe_ref
run #7: crashed: unregister_netdevice: waiting for DEV to become free
run #8: crashed: WARNING in get_probe_ref
run #9: crashed: WARNING in get_probe_ref
run #10: crashed: unregister_netdevice: waiting for DEV to become free
run #11: crashed: WARNING in get_probe_ref
run #12: crashed: unregister_netdevice: waiting for DEV to become free
run #13: crashed: WARNING in get_probe_ref
run #14: crashed: unregister_netdevice: waiting for DEV to become free
run #15: crashed: unregister_netdevice: waiting for DEV to become free
run #16: crashed: unregister_netdevice: waiting for DEV to become free
run #17: crashed: unregister_netdevice: waiting for DEV to become free
run #18: crashed: unregister_netdevice: waiting for DEV to become free
run #19: crashed: unregister_netdevice: waiting for DEV to become free
testing current HEAD eb045674aab31aa55a4f9aec27cce36e3d946a21
testing commit eb045674aab31aa55a4f9aec27cce36e3d946a21
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 6cf7bf216eb33c77ccbb5f2b93e05f4b82615694fc98a6e65a76823beb691767
run #0: crashed: WARNING in get_probe_ref
run #1: crashed: unregister_netdevice: waiting for DEV to become free
run #2: crashed: unregister_netdevice: waiting for DEV to become free
run #3: crashed: unregister_netdevice: waiting for DEV to become free
run #4: crashed: WARNING in get_probe_ref
run #5: crashed: WARNING in get_probe_ref
run #6: crashed: WARNING in get_probe_ref
run #7: crashed: WARNING in get_probe_ref
run #8: crashed: WARNING in get_probe_ref
run #9: crashed: WARNING in get_probe_ref
revisions tested: 2, total time: 29m0.609662286s (build: 21m40.399740438s, test: 6m53.602682799s)
the crash still happens on HEAD
commit msg: Linux 4.14.272
crash: WARNING in get_probe_ref
RDX: 0000000020000140 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007ffe71264fa0 R08: 0000000000000002 R09: 00007f2b49003533
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8298 at kernel/trace/blktrace.c:1190 blk_register_tracepoints kernel/trace/blktrace.c:1188 [inline]
WARNING: CPU: 0 PID: 8298 at kernel/trace/blktrace.c:1190 get_probe_ref+0x23c/0x280 kernel/trace/blktrace.c:340
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8298 Comm: syz-executor251 Not tainted 4.14.272-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x14b/0x1e7 lib/dump_stack.c:58
 panic+0x1b0/0x358 kernel/panic.c:183
 __warn.cold.7+0x25/0x25 kernel/panic.c:547
 report_bug+0x1a1/0x200 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:blk_register_tracepoints kernel/trace/blktrace.c:1190 [inline]
RIP: 0010:get_probe_ref+0x23c/0x280 kernel/trace/blktrace.c:340
RSP: 0018:ffff8880ab43fa78 EFLAGS: 00010282
RAX: 00000000fffffff4 RBX: 00000000fffffff0 RCX: dffffc0000000000
RDX: 1ffffffff11e1151 RSI: 0000000000000000 RDI: 0000000000000282
RBP: ffff8880ab43fa78 R08: ffffffff8b09c940 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ac028780
R13: ffff8880b4290b70 R14: 0000000000000000 R15: ffff8880b4290b40
 do_blk_trace_setup+0x6e4/0xa50 kernel/trace/blktrace.c:602
 __blk_trace_setup+0xa8/0x110 kernel/trace/blktrace.c:621
 blk_trace_setup+0x47/0x70 kernel/trace/blktrace.c:639
 sg_ioctl+0xda6/0x2e40 drivers/scsi/sg.c:1131
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x74/0x80 fs/ioctl.c:692
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f2b49db0cb9
RSP: 002b:00007ffe71264f98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f2b49db0cb9
RDX: 0000000020000140 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007ffe71264fa0 R08: 0000000000000002 R09: 00007f2b49003533
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..