WARNING in tracepoint_probe_register_prio (3)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: a78622932c27 bpf: sockmap, fix double-free
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1305ba77800000
kernel config: https://syzkaller.appspot.com/x/.config?x=b632d8e2c2ab2c1
dashboard link: https://syzkaller.appspot.com/bug?extid=774fddf07b7ab29a1e55
compiler: gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+774fdd...@syzkaller.appspotmail.com

WARNING: CPU: 0 PID: 11734 at kernel/tracepoint.c:210 tracepoint_add_func
kernel/tracepoint.c:210 [inline]
WARNING: CPU: 0 PID: 11734 at kernel/tracepoint.c:210
tracepoint_probe_register_prio+0x3b4/0xa50 kernel/tracepoint.c:282
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 11734 Comm: syz-executor1 Not tainted 4.17.0-rc4+ #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1b9/0x294 lib/dump_stack.c:113
panic+0x22f/0x4de kernel/panic.c:184
__warn.cold.8+0x163/0x1b3 kernel/panic.c:536
report_bug+0x252/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:tracepoint_add_func kernel/tracepoint.c:210 [inline]
RIP: 0010:tracepoint_probe_register_prio+0x3b4/0xa50 kernel/tracepoint.c:282
RSP: 0018:ffff8801c7977438 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff8801c7977518 RCX: ffffc900080f9000
RDX: 00000000000012a1 RSI: ffffffff817a9d34 RDI: ffff8801c29ddab0
RBP: ffff8801c7977540 R08: ffff880197448700 R09: fffffbfff11b803c
R10: ffff8801c7977428 R11: ffffffff88dc01e7 R12: 00000000ffffffef
R13: 00000000ffffffff R14: ffffffff81516c90 R15: 0000000000000001
tracepoint_probe_register+0x2a/0x40 kernel/tracepoint.c:303
trace_event_reg+0x19a/0x350 kernel/trace/trace_events.c:305
perf_trace_event_reg kernel/trace/trace_event_perf.c:123 [inline]
perf_trace_event_init+0x4fe/0x990 kernel/trace/trace_event_perf.c:198
perf_trace_init+0x186/0x250 kernel/trace/trace_event_perf.c:222
perf_tp_event_init+0xa6/0x120 kernel/events/core.c:8337
perf_try_init_event+0x137/0x2f0 kernel/events/core.c:9734
perf_init_event kernel/events/core.c:9772 [inline]
perf_event_alloc.part.91+0x1248/0x3090 kernel/events/core.c:10038
perf_event_alloc kernel/events/core.c:10394 [inline]
__do_sys_perf_event_open+0xa8a/0x2fa0 kernel/events/core.c:10495
__se_sys_perf_event_open kernel/events/core.c:10384 [inline]
__x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10384
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007f136b4f5c68 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f136b4f66d4 RCX: 0000000000455a09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002001d000
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000014
R13: 000000000000050c R14: 00000000006fb9c0 R15: 0000000000000003
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot.

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit: ecb9f80d net/mvpp2: Replace tasklet with softirq hrtimer
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=115730ac600000
kernel config: https://syzkaller.appspot.com/x/.config?x=d4cf1ffb87d590d7
dashboard link: https://syzkaller.appspot.com/bug?extid=774fddf07b7ab29a1e55
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11b02a22600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+774fdd...@syzkaller.appspotmail.com

WARNING: CPU: 0 PID: 8824 at kernel/tracepoint.c:243 tracepoint_add_func
kernel/tracepoint.c:243 [inline]
WARNING: CPU: 0 PID: 8824 at kernel/tracepoint.c:243
tracepoint_probe_register_prio+0x216/0x790 kernel/tracepoint.c:315

Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8824 Comm: syz-executor.4 Not tainted 5.3.0-rc3+ #133

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]

dump_stack+0x172/0x1f0 lib/dump_stack.c:113
panic+0x2dc/0x755 kernel/panic.c:219
__warn.cold+0x20/0x4c kernel/panic.c:576
report_bug+0x263/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:179 [inline]
fixup_bug arch/x86/kernel/traps.c:174 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:tracepoint_add_func kernel/tracepoint.c:243 [inline]
RIP: 0010:tracepoint_probe_register_prio+0x216/0x790 kernel/tracepoint.c:315
Code: 48 89 f8 48 c1 e8 03 80 3c 08 00 0f 85 bf 04 00 00 48 8b 45 b8 49 3b
45 08 0f 85 21 ff ff ff 41 bd ef ff ff ff e8 aa 8c fe ff <0f> 0b e8 a3 8c
fe ff 48 c7 c7 20 44 de 88 e8 d7 1d ca 05 44 89 e8
RSP: 0018:ffff88807b5a7498 EFLAGS: 00010293
RAX: ffff8880a87a85c0 RBX: ffffffff89a1eb00 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8173fcd6 RDI: ffff88808afc4698
RBP: ffff88807b5a74f0 R08: ffff8880a87a85c0 R09: fffffbfff11bc885
R10: ffff88807b5a7488 R11: ffffffff88de4427 R12: ffff88808afc4690
R13: 00000000ffffffef R14: 00000000ffffffff R15: ffffffff8177f710
tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:335
register_trace_sched_wakeup include/trace/events/sched.h:96 [inline]
tracing_sched_register kernel/trace/trace_sched_switch.c:54 [inline]
tracing_start_sched_switch+0xa8/0x190 kernel/trace/trace_sched_switch.c:106
tracing_start_cmdline_record+0x13/0x20
kernel/trace/trace_sched_switch.c:131
trace_printk_init_buffers kernel/trace/trace.c:3050 [inline]
trace_printk_init_buffers.cold+0xdf/0xe9 kernel/trace/trace.c:3013
bpf_get_trace_printk_proto+0xe/0x20 kernel/trace/bpf_trace.c:338
cgroup_base_func_proto kernel/bpf/cgroup.c:799 [inline]
cgroup_base_func_proto.isra.0+0x10e/0x120 kernel/bpf/cgroup.c:776
cg_sockopt_func_proto+0x53/0x70 kernel/bpf/cgroup.c:1411
check_helper_call+0x141/0x32f0 kernel/bpf/verifier.c:3950
do_check+0x6213/0x89f0 kernel/bpf/verifier.c:7707
bpf_check+0x6f99/0x9948 kernel/bpf/verifier.c:9294
bpf_prog_load+0xe68/0x1670 kernel/bpf/syscall.c:1698
__do_sys_bpf+0xc43/0x3460 kernel/bpf/syscall.c:2849
__se_sys_bpf kernel/bpf/syscall.c:2808 [inline]
__x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2808
do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc4bf1dec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 0000000000000070 RSI: 0000000020000180 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc4bf1df6d4
R13: 00000000004bfc7c R14: 00000000004d1938 R15: 00000000ffffffff

[syzbot]

syzbot has bisected this bug to:

commit ecb9f80db23a7ab09b46b298b404e41dd7aff6e6
Author: Thomas Gleixner <tg...@linutronix.de>
Date: Tue Aug 13 08:00:25 2019 +0000

net/mvpp2: Replace tasklet with softirq hrtimer

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13ffb9ee600000
start commit: ecb9f80d net/mvpp2: Replace tasklet with softirq hrtimer
git tree: net-next
final crash: https://syzkaller.appspot.com/x/report.txt?x=100079ee600000
console output: https://syzkaller.appspot.com/x/log.txt?x=17ffb9ee600000

kernel config: https://syzkaller.appspot.com/x/.config?x=d4cf1ffb87d590d7
dashboard link: https://syzkaller.appspot.com/bug?extid=774fddf07b7ab29a1e55

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11b02a22600000

Reported-by: syzbot+774fdd...@syzkaller.appspotmail.com
Fixes: ecb9f80db23a ("net/mvpp2: Replace tasklet with softirq hrtimer")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[Sebastian Andrzej Siewior]

On 2019-08-16 05:32:00 [-0700], syzbot wrote:
> syzbot has bisected this bug to:
>
> commit ecb9f80db23a7ab09b46b298b404e41dd7aff6e6
> Author: Thomas Gleixner <tg...@linutronix.de>
> Date: Tue Aug 13 08:00:25 2019 +0000
>
> net/mvpp2: Replace tasklet with softirq hrtimer
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13ffb9ee600000

that bisect is wrong. That warning triggered once and this commit was
the top most one in net-next at the time…

Sebastian