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Date:   Sun, 05 Nov 2017 01:05:01 -0700
From:   syzbot 
Subject: WARNING in tracepoint_probe_unregister


syzkaller hit the following crash on  
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See
for information about syzkaller reproducers

WARNING: CPU: 1 PID: 2992 at kernel/tracepoint.c:243 tracepoint_remove_func  
kernel/tracepoint.c:243 [inline]
WARNING: CPU: 1 PID: 2992 at kernel/tracepoint.c:243  
tracepoint_probe_unregister+0x6b3/0x870 kernel/tracepoint.c:324
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 2992 Comm: syzkaller812809 Not tainted  
4.14.0-rc5-next-20171018+ #8
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:16 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:52
  panic+0x1e4/0x41c kernel/panic.c:183
  __warn+0x1c4/0x1e0 kernel/panic.c:546
  report_bug+0x211/0x2d0 lib/bug.c:183
  fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177
  do_trap_no_signal arch/x86/kernel/traps.c:211 [inline]
  do_trap+0x260/0x390 arch/x86/kernel/traps.c:260
  do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310
  invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:tracepoint_remove_func kernel/tracepoint.c:243 [inline]
RIP: 0010:tracepoint_probe_unregister+0x6b3/0x870 kernel/tracepoint.c:324
RSP: 0018:ffff8800397df890 EFLAGS: 00010293
RAX: ffff88003982e8c0 RBX: 00000000fffffffe RCX: ffffffff81710233
RDX: 0000000000000000 RSI: ffffffff85b679c0 RDI: 0000000000000282
RBP: ffff8800397df9a8 R08: 0000000000000001 R09: 1ffff100072fbe6e
R10: ffff8800397df880 R11: 0000000000000001 R12: ffffffff8175b5e0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8800397df980
  unregister_trace_block_rq_remap include/trace/events/block.h:602 [inline]
  blk_unregister_tracepoints+0x1e/0x160 kernel/trace/blktrace.c:1079
  blk_trace_cleanup+0x28/0x30 kernel/trace/blktrace.c:336
  blk_trace_remove+0x55/0x80 kernel/trace/blktrace.c:348
  sg_ioctl+0x5eb/0x2d90 drivers/scsi/sg.c:1098
  vfs_ioctl fs/ioctl.c:45 [inline]
  do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:685
  SYSC_ioctl fs/ioctl.c:700 [inline]
  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
RIP: 0033:0x4396a9
RSP: 002b:00007ffd4d3facb8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006ccac0 RCX: 00000000004396a9
RDX: 000000002002d000 RSI: 4000000000001276 RDI: 0000000000000004
RBP: 0000000000000082 R08: 00000000000000fe R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000038
R13: ffffffffffffffff R14: 0000000000401eb0 R15: 0000000000000000
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

This bug is generated by a dumb bot. It may contain errors.
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View attachment "config.txt" of type "text/plain" (124357 bytes)

Download attachment "raw.log" of type "application/octet-stream" (5227 bytes)

View attachment "repro.txt" of type "text/plain" (811 bytes)

Download attachment "repro.c" of type "application/octet-stream" (3556 bytes)

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