bisecting fixing commit since 4707d8e5727387e36ea99c74d5ff0ad227700fd0 building syzkaller on e6b89e4e5adde15c0dc0a241e03dc215f2e249b3 testing commit 4707d8e5727387e36ea99c74d5ff0ad227700fd0 with gcc (GCC) 8.1.0 kernel signature: 94c79acb8da4a0513b740a16db34c398899f361ac203934d9d8d691e478a4c76 run #0: crashed: INFO: task hung in pipe_read run #1: crashed: INFO: task hung in pipe_write run #2: crashed: INFO: task hung in pipe_write run #3: crashed: INFO: task hung in pipe_write run #4: crashed: INFO: task hung in pipe_write run #5: crashed: INFO: task hung in pipe_write run #6: crashed: INFO: task hung in pipe_read run #7: crashed: INFO: task hung in pipe_write run #8: crashed: INFO: task hung in pipe_write run #9: crashed: INFO: task hung in pipe_read testing current HEAD 399849e4654ea496a6217ba4e5ee3d304c995ab4 testing commit 399849e4654ea496a6217ba4e5ee3d304c995ab4 with gcc (GCC) 8.1.0 kernel signature: 27260e6fbae4e265d65ffe20f3c53d8e766a6d19df25ff5f92f6ffd1e1c3a873 run #0: crashed: INFO: task hung in pipe_write run #1: crashed: INFO: task hung in pipe_write run #2: crashed: INFO: task hung in pipe_write run #3: crashed: INFO: task hung in pipe_write run #4: crashed: INFO: task hung in pipe_write run #5: crashed: INFO: task hung in pipe_read run #6: crashed: INFO: task hung in pipe_write run #7: crashed: INFO: task hung in pipe_read run #8: crashed: INFO: task hung in pipe_write run #9: OK revisions tested: 2, total time: 37m38.778181367s (build: 17m24.405185169s, test: 19m39.359907165s) the crash still happens on HEAD commit msg: Linux 4.19.131 crash: INFO: task hung in pipe_write NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.2:26395 blocked for more than 140 seconds. Not tainted 4.19.131-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29448 26395 6575 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] pipe_write+0xa6/0xd00 fs/pipe.c:380 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 18 48 83 c4 20 c3 e8 86 34 00 00 e9 71 ff ff ff cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 a1 00 00 00 48 83 ec 38 48 89 <6c> 24 30 48 8d 6c 24 30 48 8b 42 08 48 89 44 24 28 48 8b 0d 77 a4 RSP: 002b:00007fe8d2e5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050c980 RCX: 000000000045ca69 RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cec R14: 00000000004cf3d4 R15: 00007fe8d2e5d6d4 INFO: task syz-executor.2:26402 blocked for more than 140 seconds. Not tainted 4.19.131-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29136 26402 6575 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] pipe_write+0xa6/0xd00 fs/pipe.c:380 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 18 48 83 c4 20 c3 e8 86 34 00 00 e9 71 ff ff ff cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 a1 00 00 00 48 83 ec 38 48 89 <6c> 24 30 48 8d 6c 24 30 48 8b 42 08 48 89 44 24 28 48 8b 0d 77 a4 RSP: 002b:00007fe8d2e5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050c980 RCX: 000000000045ca69 RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cec R14: 00000000004cf3d4 R15: 00007fe8d2e5d6d4 INFO: task syz-executor.2:26606 blocked for more than 140 seconds. Not tainted 4.19.131-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29136 26606 6575 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] pipe_write+0xa6/0xd00 fs/pipe.c:380 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 18 48 83 c4 20 c3 e8 86 34 00 00 e9 71 ff ff ff cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 a1 00 00 00 48 83 ec 38 48 89 <6c> 24 30 48 8d 6c 24 30 48 8b 42 08 48 89 44 24 28 48 8b 0d 77 a4 RSP: 002b:00007fe8d2e5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050c980 RCX: 000000000045ca69 RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cec R14: 00000000004cf3d4 R15: 00007fe8d2e5d6d4 INFO: task syz-executor.2:26629 blocked for more than 140 seconds. Not tainted 4.19.131-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29784 26629 6575 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] pipe_write+0xa6/0xd00 fs/pipe.c:380 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: Bad RIP value. RSP: 002b:00007fe8d2e5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050c980 RCX: 000000000045ca69 RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cec R14: 00000000004cf3d4 R15: 00007fe8d2e5d6d4 INFO: task syz-executor.2:27071 blocked for more than 140 seconds. Not tainted 4.19.131-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29448 27071 6575 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] pipe_write+0xa6/0xd00 fs/pipe.c:380 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: Bad RIP value. RSP: 002b:00007fe8d2e5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050c980 RCX: 000000000045ca69 RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cec R14: 00000000004cf3d4 R15: 00007fe8d2e5d6d4 INFO: task syz-executor.2:27106 blocked for more than 140 seconds. Not tainted 4.19.131-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29784 27106 6575 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] pipe_write+0xa6/0xd00 fs/pipe.c:380 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: Bad RIP value. RSP: 002b:00007fe8d2e5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050c980 RCX: 000000000045ca69 RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cec R14: 00000000004cf3d4 R15: 00007fe8d2e5d6d4 INFO: task syz-executor.2:27148 blocked for more than 140 seconds. Not tainted 4.19.131-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29784 27148 6575 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] pipe_write+0xa6/0xd00 fs/pipe.c:380 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 18 48 83 c4 20 c3 e8 86 34 00 00 e9 71 ff ff ff cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 a1 00 00 00 48 83 ec 38 48 89 <6c> 24 30 48 8d 6c 24 30 48 8b 42 08 48 89 44 24 28 48 8b 0d 77 a4 RSP: 002b:00007fe8d2e5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050c980 RCX: 000000000045ca69 RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cec R14: 00000000004cf3d4 R15: 00007fe8d2e5d6d4 INFO: task syz-executor.2:27309 blocked for more than 140 seconds. Not tainted 4.19.131-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29784 27309 6575 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] pipe_write+0xa6/0xd00 fs/pipe.c:380 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 18 48 83 c4 20 c3 e8 86 34 00 00 e9 71 ff ff ff cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 a1 00 00 00 48 83 ec 38 48 89 <6c> 24 30 48 8d 6c 24 30 48 8b 42 08 48 89 44 24 28 48 8b 0d 77 a4 RSP: 002b:00007fe8d2e5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050c980 RCX: 000000000045ca69 RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cec R14: 00000000004cf3d4 R15: 00007fe8d2e5d6d4 INFO: task syz-executor.2:27334 blocked for more than 140 seconds. Not tainted 4.19.131-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29784 27334 6575 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] pipe_write+0xa6/0xd00 fs/pipe.c:380 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 18 48 83 c4 20 c3 e8 86 34 00 00 e9 71 ff ff ff cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 a1 00 00 00 48 83 ec 38 48 89 <6c> 24 30 48 8d 6c 24 30 48 8b 42 08 48 89 44 24 28 48 8b 0d 77 a4 RSP: 002b:00007fe8d2e5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050c980 RCX: 000000000045ca69 RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cec R14: 00000000004cf3d4 R15: 00007fe8d2e5d6d4 INFO: task syz-executor.2:27381 blocked for more than 140 seconds. Not tainted 4.19.131-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29784 27381 6575 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] pipe_write+0xa6/0xd00 fs/pipe.c:380 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 18 48 83 c4 20 c3 e8 86 34 00 00 e9 71 ff ff ff cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 a1 00 00 00 48 83 ec 38 48 89 <6c> 24 30 48 8d 6c 24 30 48 8b 42 08 48 89 44 24 28 48 8b 0d 77 a4 RSP: 002b:00007fe8d2e5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050c980 RCX: 000000000045ca69 RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cec R14: 00000000004cf3d4 R15: 00007fe8d2e5d6d4 Showing all locks held in the system: 1 lock held by khungtaskd/1078: #0: 000000007c439204 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4442 1 lock held by in:imklog/6085: #0: 00000000a1c63d0d (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 1 lock held by syz-executor.2/26390: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:62 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:70 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_wait+0x185/0x1b0 fs/pipe.c:118 1 lock held by syz-executor.2/26395: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/26402: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/26606: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/26629: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27071: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27106: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27148: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27309: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27334: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27381: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27453: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27481: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27519: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27553: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27605: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27766: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27797: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27835: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27870: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/27903: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/28656: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/28694: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/28893: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/28925: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/28947: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/28966: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/28981: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29003: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29029: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29056: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29191: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29225: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29266: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29298: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29334: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29368: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29569: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29602: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29637: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29660: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29687: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29721: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29748: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29780: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29802: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29831: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29855: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29894: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29933: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/29971: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30005: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30034: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30055: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30082: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30112: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30155: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30191: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30229: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30265: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30291: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30309: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30333: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30354: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30373: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30409: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30437: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30461: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30500: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30563: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30611: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30691: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30920: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30947: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/30978: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31038: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31071: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31094: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31124: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31144: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31218: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31240: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31273: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31376: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31522: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31553: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31699: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31721: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/31996: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32118: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32149: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32189: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32201: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32235: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32307: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32342: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32377: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32410: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32443: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32488: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32524: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32547: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32567: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32610: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32666: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32697: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32734: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/32766: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 1 lock held by syz-executor.2/413: #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: 0000000029b39707 (&pipe->mutex/1){+.+.}, at: pipe_write+0xa6/0xd00 fs/pipe.c:380 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1078 Comm: khungtaskd Not tainted 4.19.131-syzkaller #0 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+0x17c/0x22a lib/dump_stack.c:118 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf5/0x119 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:203 [inline] watchdog+0x5c3/0xb40 kernel/hung_task.c:287 kthread+0x324/0x3e0 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3686 Comm: systemd-journal Not tainted 4.19.131-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:___bpf_prog_run+0x79/0x51a0 kernel/bpf/core.c:1065 Code: 0f b6 04 20 38 d0 7f 08 84 c0 0f 85 b8 35 00 00 0f b6 03 48 8d 3c c5 40 02 2f 87 48 89 c6 48 89 fa 48 c1 ea 03 42 80 3c 22 00 <0f> 85 a5 35 00 00 41 ff 24 c6 48 8d 7b 01 48 89 f8 48 89 fa 48 c1 RSP: 0018:ffff888093db79e8 EFLAGS: 00000246 RAX: 00000000000000b4 RBX: ffffc9000192b1e0 RCX: 00000000000000e8 RDX: 1ffffffff0e5e0fc RSI: 00000000000000b4 RDI: ffffffff872f07e0 RBP: ffff888093db7a50 R08: ffff888093db7fc0 R09: ffff888093db7fd0 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffed10127b6f5a R14: ffffffff872f0240 R15: ffff888093db7ac0 FS: 00007fb3fa9828c0(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb3f7e3b000 CR3: 00000000943c8000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __bpf_prog_run32+0x91/0xd0 kernel/bpf/core.c:1436 seccomp_run_filters+0x111/0x680 kernel/seccomp.c:211 __seccomp_filter+0x9e/0xa50 kernel/seccomp.c:668 __secure_computing+0xc7/0x2e0 kernel/seccomp.c:795 syscall_trace_enter+0x499/0x10f0 arch/x86/entry/common.c:121 do_syscall_64+0x386/0x4e0 arch/x86/entry/common.c:283 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb3f9c4c2e3 Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 29 54 2b 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24 RSP: 002b:00007ffdc6b27528 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 000055c080ea4200 RCX: 00007fb3f9c4c2e3 RDX: 0000000000000013 RSI: 00007ffdc6b27530 RDI: 0000000000000008 RBP: 00007ffdc6b27720 R08: 00007ffdc6baf000 R09: 0000006fc7f4a7d5 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdc6b27530 R13: 0000000000000001 R14: ffffffffffffffff R15: 0005a9d095ba69dd