syzbot


INFO: task hung in uprobe_start_dup_mmap

Status: auto-closed as invalid on 2019/10/05 21:52
Subsystems: perf
[Documentation on labels]
Reported-by: syzbot+cad3df271fa4d88da051@syzkaller.appspotmail.com
First crash: 2030d, last: 1815d
Discussions (3)
Title Replies (including bot) Last reply
Reminder: 19 open syzbot bugs in perf subsystem 2 (2) 2019/07/24 13:22
Reminder: 22 open syzbot bugs in perf subsystem 7 (7) 2019/07/03 11:34
INFO: task hung in uprobe_start_dup_mmap 0 (1) 2018/09/06 16:59
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in uprobe_start_dup_mmap (2) 2 814d 830d 0/1 auto-closed as invalid on 2022/05/04 01:46
linux-4.19 INFO: task hung in uprobe_start_dup_mmap (3) 1 537d 537d 0/1 auto-obsoleted due to no activity on 2023/02/05 00:29
linux-4.19 INFO: task hung in uprobe_start_dup_mmap 1 1741d 1741d 0/1 auto-closed as invalid on 2019/10/25 08:44
upstream INFO: task hung in uprobe_start_dup_mmap (2) perf 4 806d 820d 0/26 closed as invalid on 2022/02/08 09:50

Sample crash report:
INFO: task udevd:7906 blocked for more than 143 seconds.
      Not tainted 5.1.0-rc1+ #34
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
udevd           D27032  7906   3876 0x00000000
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:285 [inline]
 rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:302
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read kernel/locking/percpu-rwsem.c:85 [inline]
 __percpu_down_read+0x8d/0xf0 kernel/locking/percpu-rwsem.c:41
 percpu_down_read include/linux/percpu-rwsem.h:49 [inline]
 uprobe_start_dup_mmap+0xbf/0xe0 kernel/events/uprobes.c:1512
 dup_mmap kernel/fork.c:471 [inline]
 dup_mm kernel/fork.c:1319 [inline]
 copy_mm kernel/fork.c:1374 [inline]
 copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
 copy_process kernel/fork.c:1709 [inline]
 _do_fork+0x257/0xfd0 kernel/fork.c:2226
 __do_sys_clone kernel/fork.c:2333 [inline]
 __se_sys_clone kernel/fork.c:2327 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2327
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7ff03d0a5f46
Code: Bad RIP value.
RSP: 002b:00007fffc69371a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fffc69371a0 RCX: 00007ff03d0a5f46
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fffc6937200 R08: 0000000000001ee2 R09: 0000000000001ee2
R10: 00007ff03d9c2a70 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffc69371c0 R14: 0000000000000005 R15: 0000000000000005
INFO: task udevd:7907 blocked for more than 143 seconds.
      Not tainted 5.1.0-rc1+ #34
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
udevd           D27592  7907   3876 0x00000000
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:285 [inline]
 rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:302
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read kernel/locking/percpu-rwsem.c:85 [inline]
 __percpu_down_read+0x8d/0xf0 kernel/locking/percpu-rwsem.c:41
 percpu_down_read include/linux/percpu-rwsem.h:49 [inline]
 uprobe_start_dup_mmap+0xbf/0xe0 kernel/events/uprobes.c:1512
 dup_mmap kernel/fork.c:471 [inline]
 dup_mm kernel/fork.c:1319 [inline]
 copy_mm kernel/fork.c:1374 [inline]
 copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
 copy_process kernel/fork.c:1709 [inline]
 _do_fork+0x257/0xfd0 kernel/fork.c:2226
 __do_sys_clone kernel/fork.c:2333 [inline]
 __se_sys_clone kernel/fork.c:2327 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2327
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7ff03d0a5f46
Code: Bad RIP value.
RSP: 002b:00007fffc69371a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fffc69371a0 RCX: 00007ff03d0a5f46
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fffc6937200 R08: 0000000000001ee3 R09: 0000000000001ee3
R10: 00007ff03d9c2a70 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffc69371c0 R14: 0000000000000005 R15: 0000000000000005
INFO: task syz-executor.1:7939 blocked for more than 143 seconds.
      Not tainted 5.1.0-rc1+ #34
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D24176  7939      1 0x00000006
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:285 [inline]
 rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:302
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read kernel/locking/percpu-rwsem.c:85 [inline]
 __percpu_down_read+0x8d/0xf0 kernel/locking/percpu-rwsem.c:41
 percpu_down_read include/linux/percpu-rwsem.h:49 [inline]
 uprobe_start_dup_mmap+0xbf/0xe0 kernel/events/uprobes.c:1512
 dup_mmap kernel/fork.c:471 [inline]
 dup_mm kernel/fork.c:1319 [inline]
 copy_mm kernel/fork.c:1374 [inline]
 copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
 copy_process kernel/fork.c:1709 [inline]
 _do_fork+0x257/0xfd0 kernel/fork.c:2226
 __do_sys_clone kernel/fork.c:2333 [inline]
 __se_sys_clone kernel/fork.c:2327 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2327
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4567da
Code: Bad RIP value.
RSP: 002b:00007fff81d6a480 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff81d6a480 RCX: 00000000004567da
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff81d6a4c0 R08: 0000000000000001 R09: 000000000260f940
R10: 000000000260fc10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff81d6a510
INFO: task syz-executor.2:7942 blocked for more than 144 seconds.
      Not tainted 5.1.0-rc1+ #34
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D24176  7942      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:285 [inline]
 rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:302
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read kernel/locking/percpu-rwsem.c:85 [inline]
 __percpu_down_read+0x8d/0xf0 kernel/locking/percpu-rwsem.c:41
 percpu_down_read include/linux/percpu-rwsem.h:49 [inline]
 uprobe_start_dup_mmap+0xbf/0xe0 kernel/events/uprobes.c:1512
 dup_mmap kernel/fork.c:471 [inline]
 dup_mm kernel/fork.c:1319 [inline]
 copy_mm kernel/fork.c:1374 [inline]
 copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
 copy_process kernel/fork.c:1709 [inline]
 _do_fork+0x257/0xfd0 kernel/fork.c:2226
 __do_sys_clone kernel/fork.c:2333 [inline]
 __se_sys_clone kernel/fork.c:2327 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2327
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4567da
Code: Bad RIP value.
RSP: 002b:00007ffce6917ec0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffce6917ec0 RCX: 00000000004567da
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffce6917f00 R08: 0000000000000001 R09: 0000000001b50940
R10: 0000000001b50c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffce6917f50
INFO: task syz-executor.3:7945 blocked for more than 144 seconds.
      Not tainted 5.1.0-rc1+ #34
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D24344  7945      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:285 [inline]
 rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:302
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read kernel/locking/percpu-rwsem.c:85 [inline]
 __percpu_down_read+0x8d/0xf0 kernel/locking/percpu-rwsem.c:41
 percpu_down_read include/linux/percpu-rwsem.h:49 [inline]
 uprobe_start_dup_mmap+0xbf/0xe0 kernel/events/uprobes.c:1512
 dup_mmap kernel/fork.c:471 [inline]
 dup_mm kernel/fork.c:1319 [inline]
 copy_mm kernel/fork.c:1374 [inline]
 copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
 copy_process kernel/fork.c:1709 [inline]
 _do_fork+0x257/0xfd0 kernel/fork.c:2226
 __do_sys_clone kernel/fork.c:2333 [inline]
 __se_sys_clone kernel/fork.c:2327 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2327
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4567da
Code: Bad RIP value.
RSP: 002b:00007ffc13534700 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc13534700 RCX: 00000000004567da
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc13534740 R08: 0000000000000001 R09: 000000000180d940
R10: 000000000180dc10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc13534790
INFO: task syz-executor.4:7949 blocked for more than 144 seconds.
      Not tainted 5.1.0-rc1+ #34
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D24176  7949      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:285 [inline]
 rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:302
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read kernel/locking/percpu-rwsem.c:85 [inline]
 __percpu_down_read+0x8d/0xf0 kernel/locking/percpu-rwsem.c:41
 percpu_down_read include/linux/percpu-rwsem.h:49 [inline]
 uprobe_start_dup_mmap+0xbf/0xe0 kernel/events/uprobes.c:1512
 dup_mmap kernel/fork.c:471 [inline]
 dup_mm kernel/fork.c:1319 [inline]
 copy_mm kernel/fork.c:1374 [inline]
 copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
 copy_process kernel/fork.c:1709 [inline]
 _do_fork+0x257/0xfd0 kernel/fork.c:2226
 __do_sys_clone kernel/fork.c:2333 [inline]
 __se_sys_clone kernel/fork.c:2327 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2327
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4567da
Code: Bad RIP value.
RSP: 002b:00007ffce5f4c2e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffce5f4c2e0 RCX: 00000000004567da
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffce5f4c320 R08: 0000000000000001 R09: 00000000010ba940
R10: 00000000010bac10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffce5f4c370
INFO: task syz-executor.5:7951 blocked for more than 144 seconds.
      Not tainted 5.1.0-rc1+ #34
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D24176  7951      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:285 [inline]
 rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:302
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read kernel/locking/percpu-rwsem.c:85 [inline]
 __percpu_down_read+0x8d/0xf0 kernel/locking/percpu-rwsem.c:41
 percpu_down_read include/linux/percpu-rwsem.h:49 [inline]
 uprobe_start_dup_mmap+0xbf/0xe0 kernel/events/uprobes.c:1512
 dup_mmap kernel/fork.c:471 [inline]
 dup_mm kernel/fork.c:1319 [inline]
 copy_mm kernel/fork.c:1374 [inline]
 copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
 copy_process kernel/fork.c:1709 [inline]
 _do_fork+0x257/0xfd0 kernel/fork.c:2226
 __do_sys_clone kernel/fork.c:2333 [inline]
 __se_sys_clone kernel/fork.c:2327 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2327
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4567da
Code: Bad RIP value.
RSP: 002b:00007fff8ef00fc0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff8ef00fc0 RCX: 00000000004567da
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff8ef01000 R08: 0000000000000001 R09: 000000000231f940
R10: 000000000231fc10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff8ef01050
INFO: task syz-executor.0:20560 blocked for more than 145 seconds.
      Not tainted 5.1.0-rc1+ #34
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D27008 20560   7936 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 percpu_down_write+0x342/0x440 kernel/locking/percpu-rwsem.c:162
 register_for_each_vma+0x8c/0xde0 kernel/events/uprobes.c:999
 __uprobe_register kernel/events/uprobes.c:1131 [inline]
 __uprobe_register+0x45a/0x7c0 kernel/events/uprobes.c:1099
 uprobe_register_refctr+0x2e/0x40 kernel/events/uprobes.c:1153
 probe_event_enable+0x51d/0xc40 kernel/trace/trace_uprobe.c:926
 trace_uprobe_register+0x7a/0x970 kernel/trace/trace_uprobe.c:1205
 perf_trace_event_reg kernel/trace/trace_event_perf.c:124 [inline]
 perf_trace_event_init+0x500/0x990 kernel/trace/trace_event_perf.c:199
 perf_uprobe_init+0x16e/0x210 kernel/trace/trace_event_perf.c:327
 perf_uprobe_event_init+0x106/0x1a0 kernel/events/core.c:8742
 perf_try_init_event+0x137/0x3f0 kernel/events/core.c:10011
 perf_init_event kernel/events/core.c:10051 [inline]
 perf_event_alloc.part.0+0x1f2f/0x3200 kernel/events/core.c:10328
 perf_event_alloc kernel/events/core.c:10698 [inline]
 __do_sys_perf_event_open+0x830/0x24e0 kernel/events/core.c:10799
 __se_sys_perf_event_open kernel/events/core.c:10688 [inline]
 __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10688
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458209
Code: Bad RIP value.
RSP: 002b:00007f2c8b48cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458209
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f2c8b48d6d4
R13: 00000000004c47ec R14: 00000000004d7f90 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1042:
 #0: 00000000b2167e35 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5061
2 locks held by rs:main Q:Reg/7806:
1 lock held by rsyslogd/7808:
 #0: 000000002a5a72f5 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801
2 locks held by getty/7898:
 #0: 000000006121036a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000910420f6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7899:
 #0: 0000000008fe7739 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 0000000018514d3a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7900:
 #0: 00000000a4ad5a66 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 0000000077c1aed5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7901:
 #0: 00000000ff630e7d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000fc475054 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7902:
 #0: 00000000a3aae5a3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000016fef73 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7903:
 #0: 00000000138a1b68 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000671555e4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7904:
 #0: 00000000b34fd462 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000187ab4f0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
1 lock held by udevd/7906:
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mmap kernel/fork.c:471 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mm kernel/fork.c:1319 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_mm kernel/fork.c:1374 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
1 lock held by udevd/7907:
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mmap kernel/fork.c:471 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mm kernel/fork.c:1319 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_mm kernel/fork.c:1374 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
1 lock held by syz-executor.1/7939:
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mmap kernel/fork.c:471 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mm kernel/fork.c:1319 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_mm kernel/fork.c:1374 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
1 lock held by syz-executor.2/7942:
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mmap kernel/fork.c:471 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mm kernel/fork.c:1319 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_mm kernel/fork.c:1374 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
1 lock held by syz-executor.3/7945:
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mmap kernel/fork.c:471 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mm kernel/fork.c:1319 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_mm kernel/fork.c:1374 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
1 lock held by syz-executor.4/7949:
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mmap kernel/fork.c:471 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mm kernel/fork.c:1319 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_mm kernel/fork.c:1374 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
1 lock held by syz-executor.5/7951:
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mmap kernel/fork.c:471 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mm kernel/fork.c:1319 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_mm kernel/fork.c:1374 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
1 lock held by syz-executor.0/8420:
 #0: 00000000e0f08b16 (event_mutex){+.+.}, at: perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:236
2 locks held by kworker/u4:9/9062:
 #0: 00000000993799cd (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:10011 [inline]
 #0: 00000000993799cd (&rq->lock){-.-.}, at: pick_next_task_fair+0x1214/0x19a0 kernel/sched/fair.c:7062
 #1: 00000000b2167e35 (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:6059
2 locks held by syz-executor.1/23693:
 #0: 00000000ea3db4bc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 0000000003eb1797 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.3/25474:
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mmap kernel/fork.c:471 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: dup_mm kernel/fork.c:1319 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_mm kernel/fork.c:1374 [inline]
 #0: 00000000253a834f (&dup_mmap_sem){++++}, at: copy_process.part.0+0x2b94/0x7980 kernel/fork.c:1916
5 locks held by syz-executor.0/20560:
 #0: 000000002b338204 (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x6d2/0x24e0 kernel/events/core.c:10779
 #1: 0000000021451754 (&pmus_srcu){....}, at: perf_event_alloc.part.0+0xd57/0x3200 kernel/events/core.c:10324
 #2: 00000000e0f08b16 (event_mutex){+.+.}, at: perf_uprobe_init+0x163/0x210 kernel/trace/trace_event_perf.c:326
 #3: 0000000065866773 (&uprobe->register_rwsem){+.+.}, at: __uprobe_register kernel/events/uprobes.c:1127 [inline]
 #3: 0000000065866773 (&uprobe->register_rwsem){+.+.}, at: __uprobe_register+0x3c9/0x7c0 kernel/events/uprobes.c:1099
 #4: 00000000253a834f (&dup_mmap_sem){++++}, at: percpu_down_write+0x6a/0x440 kernel/locking/percpu-rwsem.c:145

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc1+ #34
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
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0x9b7/0xec0 kernel/hung_task.c:288
 kthread+0x357/0x430 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:

Crashes (196):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/03/24 04:40 upstream a5ed1e96cafd a2cef203 .config console log report ci-upstream-kasan-gce-smack-root
2019/03/05 14:36 upstream cd2a3bf02625 bb91cf81 .config console log report ci-upstream-kasan-gce-smack-root
2019/03/04 16:39 upstream 1c163f4c7b3f 7c693b52 .config console log report ci-upstream-kasan-gce-root
2019/03/03 19:49 upstream c027c7cf1577 1c0e457a .config console log report ci-upstream-kasan-gce-selinux-root
2019/03/02 19:23 upstream c93d9218ea56 1c0e457a .config console log report ci-upstream-kasan-gce-selinux-root
2019/03/01 06:42 upstream 7d762d69145a 8a4b3a6b .config console log report ci-upstream-kasan-gce-smack-root
2019/03/01 02:36 upstream 7d762d69145a 09aeeba4 .config console log report ci-upstream-kasan-gce-root
2019/02/25 22:59 upstream 7d762d69145a 8022bafd .config console log report ci-upstream-kasan-gce-root
2019/02/25 16:57 upstream 5908e6b738e3 a70141bf .config console log report ci-upstream-kasan-gce-root
2019/02/24 15:47 upstream e60b5f79bd75 7a06e792 .config console log report ci-upstream-kasan-gce-root
2019/02/22 08:06 upstream 8a61716ff2ab 7ff74a98 .config console log report ci-upstream-kasan-gce-root
2019/02/21 07:57 upstream f6163d67cc31 c95f0707 .config console log report ci-upstream-kasan-gce-root
2019/02/17 11:11 upstream 64c0133eb88a f42dee6d .config console log report ci-upstream-kasan-gce-smack-root
2019/02/17 04:18 upstream 64c0133eb88a f42dee6d .config console log report ci-upstream-kasan-gce-smack-root
2019/02/13 16:41 upstream 1f947a7a011f 0a49c954 .config console log report ci-upstream-kasan-gce-selinux-root
2019/02/06 04:01 upstream 8834f5600cf3 d672172c .config console log report ci-upstream-kasan-gce-root
2019/02/05 17:39 upstream 8834f5600cf3 d672172c .config console log report ci-upstream-kasan-gce-smack-root
2019/02/05 09:07 upstream 8834f5600cf3 d672172c .config console log report ci-upstream-kasan-gce-smack-root
2019/02/04 09:21 upstream 8834f5600cf3 c198d5dd .config console log report ci-upstream-kasan-gce-smack-root
2019/02/03 19:27 upstream 24b888d8d598 c198d5dd .config console log report ci-upstream-kasan-gce-smack-root
2019/02/01 22:08 upstream 5eeb63359b1e 564f9a4f .config console log report ci-upstream-kasan-gce-smack-root
2019/02/01 17:44 upstream 5b4746a03199 0c07abcf .config console log report ci-upstream-kasan-gce-smack-root
2019/02/01 10:55 upstream 5b4746a03199 0c07abcf .config console log report ci-upstream-kasan-gce-smack-root
2019/01/28 09:35 upstream f17b5f06cb92 629c2a27 .config console log report ci-upstream-kasan-gce-smack-root
2019/01/27 20:20 upstream 983542434e6b c73f090a .config console log report ci-upstream-kasan-gce-smack-root
2019/01/27 15:40 upstream ba6069759381 c73f090a .config console log report ci-upstream-kasan-gce-smack-root
2019/01/27 07:37 upstream ba6069759381 c73f090a .config console log report ci-upstream-kasan-gce-selinux-root
2019/01/22 08:13 upstream 52e60b754438 badbbeee .config console log report ci-upstream-kasan-gce-root
2019/01/20 14:00 upstream 6e693b3ffecb 353f32ea .config console log report ci-upstream-kasan-gce-smack-root
2019/01/19 12:41 upstream 2339e91d0e66 8aa587b0 .config console log report ci-upstream-kasan-gce-root
2019/01/18 04:25 upstream a3a80255d58d 5bf17c30 .config console log report ci-upstream-kasan-gce-smack-root
2019/01/17 03:09 upstream 47bfa6d9dc8c c2faf9b2 .config console log report ci-upstream-kasan-gce-smack-root
2019/01/17 00:38 upstream 47bfa6d9dc8c d538790b .config console log report ci-upstream-kasan-gce-selinux-root
2019/01/16 12:07 upstream 7939f8beecf1 b47fa78d .config console log report ci-upstream-kasan-gce-root
2019/01/15 18:41 upstream fe76fc6aaf53 79cb1a7c .config console log report ci-upstream-kasan-gce-root
2019/04/08 21:52 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/03/30 00:10 linux-next 1baf02ec984b c35ee0ea .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/28 17:41 linux-next 42fd8df9d1d9 09aeeba4 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/17 07:47 linux-next 7a92eb7cc1dc f42dee6d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/13 02:17 linux-next b5829453d81a 1eedba36 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/11 01:32 linux-next a46228f6598a b4f792e4 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/10 04:58 linux-next a46228f6598a b4f792e4 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/08 01:46 linux-next 1bd831d68d55 aa4feb03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/07 08:38 linux-next 1bd831d68d55 d25487bc .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/06 21:48 linux-next 1a82ba1c69e3 d25487bc .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/06 14:57 linux-next 1a82ba1c69e3 d25487bc .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/06 07:38 linux-next 1a82ba1c69e3 d672172c .config console log report ci-upstream-linux-next-kasan-gce-root
2019/02/06 05:44 linux-next 1ff540338564 d672172c .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/26 21:43 linux-next 494367cb57c9 c73f090a .config console log report ci-upstream-linux-next-kasan-gce-root
2018/09/06 15:05 linux-next f2b6e66e9885 0bb7a7eb .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.