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syzkaller login: [   20.913274] ------------[ cut here ]------------
executing program
[   20.914863] WARNING: CPU: 1 PID: 2992 at kernel/tracepoint.c:243 tracepoint_probe_unregister+0x6b3/0x870
[   20.928510] Kernel panic - not syncing: panic_on_warn set ...
[   20.928510] 
[   20.929256] CPU: 1 PID: 2992 Comm: syzkaller812809 Not tainted 4.14.0-rc5-next-20171018+ #8
[   20.930053] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   20.931124] Call Trace:
[   20.931399]  dump_stack+0x194/0x257
[   20.931753]  ? arch_local_irq_restore+0x53/0x53
[   20.932179]  ? vsnprintf+0x1ed/0x1900
[   20.932522]  panic+0x1e4/0x41c
[   20.932809]  ? refcount_error_report+0x214/0x214
[   20.933237]  ? show_regs_print_info+0x65/0x65
[   20.933643]  ? __warn+0x1a9/0x1e0
[   20.933953]  ? tracepoint_probe_unregister+0x6b3/0x870
[   20.934416]  __warn+0x1c4/0x1e0
[   20.934718]  ? tracepoint_probe_unregister+0x6b3/0x870
[   20.935166]  report_bug+0x211/0x2d0
[   20.935690]  fixup_bug+0x40/0x90
[   20.935992]  do_trap+0x260/0x390
[   20.936300]  do_error_trap+0x120/0x390
[   20.936646]  ? depot_save_stack+0x12c/0x490
[   20.937033]  ? do_trap+0x390/0x390
[   20.937349]  ? tracepoint_probe_unregister+0x6b3/0x870
[   20.937813]  ? save_stack+0xa3/0xd0
[   20.938141]  ? save_stack+0x43/0xd0
[   20.938460]  ? kasan_slab_free+0x71/0xc0
[   20.938823]  ? blk_add_trace_bio_remap+0x5e0/0x5e0
[   20.939258]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   20.939682]  ? blk_add_trace_bio_remap+0x5e0/0x5e0
[   20.940271]  do_invalid_op+0x1b/0x20
[   20.940599]  invalid_op+0x18/0x20
[   20.940907] RIP: 0010:tracepoint_probe_unregister+0x6b3/0x870
[   20.941425] RSP: 0018:ffff8800397df890 EFLAGS: 00010293
[   20.941900] RAX: ffff88003982e8c0 RBX: 00000000fffffffe RCX: ffffffff81710233
[   20.942532] RDX: 0000000000000000 RSI: ffffffff85b679c0 RDI: 0000000000000282
[   20.943159] RBP: ffff8800397df9a8 R08: 0000000000000001 R09: 1ffff100072fbe6e
[   20.943906] R10: ffff8800397df880 R11: 0000000000000001 R12: ffffffff8175b5e0
[   20.944534] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8800397df980
[   20.945166]  ? blk_add_trace_bio_remap+0x5e0/0x5e0
[   20.945596]  ? tracepoint_probe_unregister+0x6b3/0x870
[   20.946063]  ? free_percpu+0x22e/0x830
[   20.946407]  ? for_each_kernel_tracepoint+0xa0/0xa0
[   20.946840]  ? trace_hardirqs_off+0xd/0x10
[   20.947206]  ? quarantine_put+0xeb/0x190
[   20.947557]  ? kfree+0xe4/0x250
[   20.947844]  ? blk_trace_free+0xf9/0x130
[   20.948297]  ? blk_add_trace_bio_remap+0x5e0/0x5e0
[   20.948793]  ? trace_hardirqs_on+0xd/0x10
[   20.949167]  blk_unregister_tracepoints+0x1e/0x160
[   20.949597]  blk_trace_cleanup+0x28/0x30
[   20.950029]  blk_trace_remove+0x55/0x80
[   20.950377]  sg_ioctl+0x5eb/0x2d90
[   20.950687]  ? lock_release+0xa40/0xa40
[   20.951038]  ? sg_new_write.isra.20+0x830/0x830
[   20.951446]  ? is_bpf_text_address+0xa4/0x120
[   20.951841]  ? avc_has_extended_perms+0x7fa/0x12c0
[   20.952588]  ? sched_set_itmt_core_prio+0x1a2/0x1d0
[   20.953042]  ? avc_ss_reset+0x110/0x110
[   20.953391]  ? putname+0xee/0x130
[   20.953697]  ? save_stack+0xa3/0xd0
[   20.954025]  ? save_stack+0x43/0xd0
[   20.954352]  ? kasan_slab_free+0x71/0xc0
[   20.954705]  ? kmem_cache_free+0x77/0x280
[   20.955065]  ? putname+0xee/0x130
[   20.955366]  ? do_sys_open+0x31b/0x6d0
[   20.955715]  ? __lock_is_held+0xb6/0x140
[   20.956245]  ? trace_event_raw_event_sched_switch+0x8a0/0x8a0
[   20.956758]  ? rcu_note_context_switch+0x710/0x710
[   20.957266]  ? get_unused_fd_flags+0x190/0x190
[   20.957672]  ? sg_new_write.isra.20+0x830/0x830
[   20.958122]  do_vfs_ioctl+0x1b1/0x1520
[   20.958466]  ? _cond_resched+0x14/0x30
[   20.958822]  ? ioctl_preallocate+0x2b0/0x2b0
[   20.959213]  ? selinux_capable+0x40/0x40
[   20.959574]  ? putname+0xf3/0x130
[   20.959880]  ? do_sys_open+0x320/0x6d0
[   20.960253]  ? security_file_ioctl+0x89/0xb0
[   20.960646]  SyS_ioctl+0x8f/0xc0
[   20.960948]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   20.961358] RIP: 0033:0x4396a9
[   20.961635] RSP: 002b:00007ffd4d3facb8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[   20.962302] RAX: ffffffffffffffda RBX: 00000000006ccac0 RCX: 00000000004396a9
[   20.962926] RDX: 000000002002d000 RSI: 4000000000001276 RDI: 0000000000000004
[   20.963554] RBP: 0000000000000082 R08: 00000000000000fe R09: 0000000000000000
[   20.964334] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000038
[   20.964974] R13: ffffffffffffffff R14: 0000000000401eb0 R15: 0000000000000000
[   20.965879] Dumping ftrace buffer:
[   20.966279]    (ftrace buffer empty)
[   20.966604] Kernel Offset: disabled
[   20.966926] Rebooting in 86400 seconds..