Hello,
syzbot found the following issue on:
HEAD commit: 9803fb968c8c Add linux-next specific files for 20210817
git tree: linux-next
console output:
https://syzkaller.appspot.com/x/log.txt?x=1346de61300000
kernel config:
https://syzkaller.appspot.com/x/.config?x=681282daead30d81
dashboard link:
https://syzkaller.appspot.com/bug?extid=dff17cacc4a7f260072c
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
CC: [
da...@davemloft.net johan....@gmail.com ku...@kernel.org linux-b...@vger.kernel.org linux-...@vger.kernel.org luiz....@gmail.com mar...@holtmann.org net...@vger.kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+dff17c...@syzkaller.appspotmail.com
INFO: task syz-executor.4:20271 can't die for more than 143 seconds.
task:syz-executor.4 state:D stack:27840 pid:20271 ppid: 6599 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:4711 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5966
schedule+0xd3/0x270 kernel/sched/core.c:6045
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104
__mutex_lock_common kernel/locking/mutex.c:1036 [inline]
__mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096
rfcomm_dlc_close+0x34/0x240 net/bluetooth/rfcomm/core.c:507
__rfcomm_sock_close+0xac/0x260 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xe9/0x210 net/bluetooth/rfcomm/sock.c:931
rfcomm_sock_release+0x5f/0x140 net/bluetooth/rfcomm/sock.c:951
__sock_release+0xcd/0x280 net/socket.c:649
sock_close+0x18/0x20 net/socket.c:1311
__fput+0x288/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
get_signal+0x1b35/0x2160 kernel/signal.c:2619
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
RSP: 002b:00007fd124977188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffffc RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff885b8e3f R14: 00007fd124977300 R15: 0000000000022000
INFO: task syz-executor.4:20271 blocked for more than 143 seconds.
Not tainted 5.14.0-rc6-next-20210817-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:27840 pid:20271 ppid: 6599 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:4711 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5966
schedule+0xd3/0x270 kernel/sched/core.c:6045
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104
__mutex_lock_common kernel/locking/mutex.c:1036 [inline]
__mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096
rfcomm_dlc_close+0x34/0x240 net/bluetooth/rfcomm/core.c:507
__rfcomm_sock_close+0xac/0x260 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xe9/0x210 net/bluetooth/rfcomm/sock.c:931
rfcomm_sock_release+0x5f/0x140 net/bluetooth/rfcomm/sock.c:951
__sock_release+0xcd/0x280 net/socket.c:649
sock_close+0x18/0x20 net/socket.c:1311
__fput+0x288/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
get_signal+0x1b35/0x2160 kernel/signal.c:2619
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
RSP: 002b:00007fd124977188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffffc RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff885b8e3f R14: 00007fd124977300 R15: 0000000000022000
INFO: task syz-executor.4:20306 can't die for more than 143 seconds.
task:syz-executor.4 state:D stack:28944 pid:20306 ppid: 6599 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4711 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5966
schedule+0xd3/0x270 kernel/sched/core.c:6045
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104
__mutex_lock_common kernel/locking/mutex.c:1036 [inline]
__mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096
rfcomm_dlc_open+0x8f/0xa80 net/bluetooth/rfcomm/core.c:425
rfcomm_sock_connect+0x32f/0x460 net/bluetooth/rfcomm/sock.c:413
__sys_connect_file+0x155/0x1a0 net/socket.c:1890
__sys_connect+0x161/0x190 net/socket.c:1907
__do_sys_connect net/socket.c:1917 [inline]
__se_sys_connect net/socket.c:1914 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1914
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
RSP: 002b:00007fd124935188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 000000000056c0f0 RCX: 00000000004665e9
RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0f0
R13: 00007fff885b8e3f R14: 00007fd124935300 R15: 0000000000022000
INFO: task syz-executor.4:20306 blocked for more than 144 seconds.
Not tainted 5.14.0-rc6-next-20210817-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:28944 pid:20306 ppid: 6599 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4711 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5966
schedule+0xd3/0x270 kernel/sched/core.c:6045
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104
__mutex_lock_common kernel/locking/mutex.c:1036 [inline]
__mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096
rfcomm_dlc_open+0x8f/0xa80 net/bluetooth/rfcomm/core.c:425
rfcomm_sock_connect+0x32f/0x460 net/bluetooth/rfcomm/sock.c:413
__sys_connect_file+0x155/0x1a0 net/socket.c:1890
__sys_connect+0x161/0x190 net/socket.c:1907
__do_sys_connect net/socket.c:1917 [inline]
__se_sys_connect net/socket.c:1914 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1914
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
RSP: 002b:00007fd124935188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 000000000056c0f0 RCX: 00000000004665e9
RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0f0
R13: 00007fff885b8e3f R14: 00007fd124935300 R15: 0000000000022000
INFO: task syz-executor.5:20280 can't die for more than 144 seconds.
task:syz-executor.5 state:D stack:28808 pid:20280 ppid: 6601 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:4711 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5966
schedule+0xd3/0x270 kernel/sched/core.c:6045
__lock_sock+0x13d/0x260 net/core/sock.c:2645
lock_sock_nested+0xf6/0x120 net/core/sock.c:3178
lock_sock include/net/sock.h:1612 [inline]
rfcomm_sk_state_change+0xb4/0x390 net/bluetooth/rfcomm/sock.c:73
__rfcomm_dlc_close+0x1b6/0x8a0 net/bluetooth/rfcomm/core.c:489
rfcomm_dlc_close+0x1ea/0x240 net/bluetooth/rfcomm/core.c:520
__rfcomm_sock_close+0xac/0x260 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xe9/0x210 net/bluetooth/rfcomm/sock.c:931
rfcomm_sock_release+0x5f/0x140 net/bluetooth/rfcomm/sock.c:951
__sock_release+0xcd/0x280 net/socket.c:649
sock_close+0x18/0x20 net/socket.c:1311
__fput+0x288/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
get_signal+0x1b35/0x2160 kernel/signal.c:2619
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
RSP: 002b:00007f11e4930188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffffc RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff5ae8d48f R14: 00007f11e4930300 R15: 0000000000022000
INFO: task syz-executor.5:20280 blocked for more than 144 seconds.
Not tainted 5.14.0-rc6-next-20210817-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5 state:D stack:28808 pid:20280 ppid: 6601 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:4711 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5966
schedule+0xd3/0x270 kernel/sched/core.c:6045
__lock_sock+0x13d/0x260 net/core/sock.c:2645
lock_sock_nested+0xf6/0x120 net/core/sock.c:3178
lock_sock include/net/sock.h:1612 [inline]
rfcomm_sk_state_change+0xb4/0x390 net/bluetooth/rfcomm/sock.c:73
__rfcomm_dlc_close+0x1b6/0x8a0 net/bluetooth/rfcomm/core.c:489
rfcomm_dlc_close+0x1ea/0x240 net/bluetooth/rfcomm/core.c:520
__rfcomm_sock_close+0xac/0x260 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xe9/0x210 net/bluetooth/rfcomm/sock.c:931
rfcomm_sock_release+0x5f/0x140 net/bluetooth/rfcomm/sock.c:951
__sock_release+0xcd/0x280 net/socket.c:649
sock_close+0x18/0x20 net/socket.c:1311
__fput+0x288/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
get_signal+0x1b35/0x2160 kernel/signal.c:2619
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
RSP: 002b:00007f11e4930188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffffc RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff5ae8d48f R14: 00007f11e4930300 R15: 0000000000022000
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.14.0-rc6-next-20210817-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline]
watchdog+0xcb7/0xed0 kernel/hung_task.c:339
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.14.0-rc6-next-20210817-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy12 ieee80211_iface_work
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1c/0x60 kernel/kcov.c:197
Code: 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 65 8b 05 89 29 8c 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 40 f0 01 00 <a9> 00 01 ff 00 74 0e 85 c9 74 35 8b 82 3c 15 00 00 85 c0 74 2b 8b
RSP: 0018:ffffc90000cd7590 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888010e45580 RSI: ffffffff888dd468 RDI: 0000000000000003
RBP: 000000000000000c R08: 0000000000000000 R09: 0000000000000016
R10: ffffffff888dd45a R11: 000000000000007f R12: 0000000000000000
R13: 0000000000000000 R14: ffff88808d275dd0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fae060b8000 CR3: 000000000b68e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ieee80211_sta_get_rates+0x4e8/0x960 net/mac80211/util.c:2114
ieee80211_update_sta_info net/mac80211/ibss.c:1003 [inline]
ieee80211_rx_bss_info net/mac80211/ibss.c:1117 [inline]
ieee80211_rx_mgmt_probe_beacon+0x53e/0x17c0 net/mac80211/ibss.c:1608
ieee80211_ibss_rx_queued_mgmt+0xd30/0x1610 net/mac80211/ibss.c:1635
ieee80211_iface_process_skb net/mac80211/iface.c:1426 [inline]
ieee80211_iface_work+0x7f7/0xa40 net/mac80211/iface.c:1462
process_one_work+0x98d/0x1630 kernel/workqueue.c:2275
worker_thread+0x658/0x11f0 kernel/workqueue.c:2421
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
0: 8b 45 00 mov 0x0(%rbp),%eax
3: 48 63 c9 movslq %ecx,%rcx
6: e9 64 ff ff ff jmpq 0xffffff6f
b: 0f 1f 00 nopl (%rax)
e: 65 8b 05 89 29 8c 7e mov %gs:0x7e8c2989(%rip),%eax # 0x7e8c299e
15: 89 c1 mov %eax,%ecx
17: 48 8b 34 24 mov (%rsp),%rsi
1b: 81 e1 00 01 00 00 and $0x100,%ecx
21: 65 48 8b 14 25 40 f0 mov %gs:0x1f040,%rdx
28: 01 00
2a: a9 00 01 ff 00 test $0xff0100,%eax <-- trapping instruction
2f: 74 0e je 0x3f
31: 85 c9 test %ecx,%ecx
33: 74 35 je 0x6a
35: 8b 82 3c 15 00 00 mov 0x153c(%rdx),%eax
3b: 85 c0 test %eax,%eax
3d: 74 2b je 0x6a
3f: 8b .byte 0x8b
---
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