bisecting fixing commit since 97a8651cadce7c2b7c4d8f108b392eff31fe2c08 building syzkaller on 77e2b66864e69c17416614228723a1ebd3581ddc testing commit 97a8651cadce7c2b7c4d8f108b392eff31fe2c08 with gcc (GCC) 8.4.1 20210217 kernel signature: 5fca3fa1d1afe505cbeb6d4da39fbd08a3ed7c8b352c069827f3b1a6e2e043d7 all runs: crashed: INFO: task hung in paste_selection testing current HEAD 9f84340f012ee60c12aacc03662bcdd67419a31a testing commit 9f84340f012ee60c12aacc03662bcdd67419a31a with gcc (GCC) 8.4.1 20210217 kernel signature: 17182445158cd7519cba891eada4f4e6560a58c08e3892462e4c6262ad183436 all runs: crashed: INFO: task hung in paste_selection revisions tested: 2, total time: 29m14.93804368s (build: 15m56.115946615s, test: 12m56.508009373s) the crash still happens on HEAD commit msg: Linux 4.19.196 crash: INFO: task hung in paste_selection Bluetooth: hci3: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci0: command 0x0406 tx timeout ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 INFO: task syz-executor.2:13171 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28744 13171 8464 0x00000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x430 drivers/tty/vt/selection.c:372 tioclinux+0xfb/0x390 drivers/tty/vt/vt.c:3055 vt_ioctl+0x19f8/0x2200 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x456/0x1290 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: 61 73 75 96 80 79 04 68 75 90 b8 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 30 81 39 73 69 6e 67 75 0e 66 <81> 79 04 6c 65 66 90 0f 84 0f ff ff ff 81 39 73 79 73 74 0f 85 57 RSP: 002b:00007f04fac73188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fffb2c0f55f R14: 00007f04fac73300 R15: 0000000000022000 INFO: task syz-executor.4:13178 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28664 13178 8463 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x430 drivers/tty/vt/selection.c:372 tioclinux+0xfb/0x390 drivers/tty/vt/vt.c:3055 vt_ioctl+0x19f8/0x2200 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x456/0x1290 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: 61 73 75 96 80 79 04 68 75 90 b8 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 30 81 39 73 69 6e 67 75 0e 66 <81> 79 04 6c 65 66 90 0f 84 0f ff ff ff 81 39 73 79 73 74 0f 85 57 RSP: 002b:00007f7bec878188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff0d690adf R14: 00007f7bec878300 R15: 0000000000022000 INFO: task syz-executor.5:13185 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28744 13185 8459 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x430 drivers/tty/vt/selection.c:372 tioclinux+0xfb/0x390 drivers/tty/vt/vt.c:3055 vt_ioctl+0x19f8/0x2200 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x456/0x1290 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: 61 73 75 96 80 79 04 68 75 90 b8 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 30 81 39 73 69 6e 67 75 0e 66 <81> 79 04 6c 65 66 90 0f 84 0f ff ff ff 81 39 73 79 73 74 0f 85 57 RSP: 002b:00007fbea7e1d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff6a3aabdf R14: 00007fbea7e1d300 R15: 0000000000022000 INFO: task syz-executor.3:13192 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28744 13192 8461 0x00000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x430 drivers/tty/vt/selection.c:372 tioclinux+0xfb/0x390 drivers/tty/vt/vt.c:3055 vt_ioctl+0x19f8/0x2200 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x456/0x1290 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: 61 73 75 96 80 79 04 68 75 90 b8 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 30 81 39 73 69 6e 67 75 0e 66 <81> 79 04 6c 65 66 90 0f 84 0f ff ff ff 81 39 73 79 73 74 0f 85 57 RSP: 002b:00007f63fe6b7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fffc9f16f9f R14: 00007f63fe6b7300 R15: 0000000000022000 INFO: task syz-executor.1:13197 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28744 13197 8458 0x00000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x430 drivers/tty/vt/selection.c:372 tioclinux+0xfb/0x390 drivers/tty/vt/vt.c:3055 vt_ioctl+0x19f8/0x2200 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x456/0x1290 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: 61 73 75 96 80 79 04 68 75 90 b8 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 30 81 39 73 69 6e 67 75 0e 66 <81> 79 04 6c 65 66 90 0f 84 0f ff ff ff 81 39 73 79 73 74 0f 85 57 RSP: 002b:00007f72520a3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffc3d09863f R14: 00007f72520a3300 R15: 0000000000022000 INFO: task syz-executor.0:13203 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28856 13203 8455 0x00000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x430 drivers/tty/vt/selection.c:372 tioclinux+0xfb/0x390 drivers/tty/vt/vt.c:3055 vt_ioctl+0x19f8/0x2200 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x456/0x1290 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: 61 73 75 96 80 79 04 68 75 90 b8 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 30 81 39 73 69 6e 67 75 0e 66 <81> 79 04 6c 65 66 90 0f 84 0f ff ff ff 81 39 73 79 73 74 0f 85 57 RSP: 002b:00007fa8ffe91188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffcfe3e413f R14: 00007fa8ffe91300 R15: 0000000000022000 INFO: task syz-executor.2:13211 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28568 13211 8464 0x00000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x430 drivers/tty/vt/selection.c:372 tioclinux+0xfb/0x390 drivers/tty/vt/vt.c:3055 vt_ioctl+0x19f8/0x2200 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x456/0x1290 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: 61 73 75 96 80 79 04 68 75 90 b8 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 30 81 39 73 69 6e 67 75 0e 66 <81> 79 04 6c 65 66 90 0f 84 0f ff ff ff 81 39 73 79 73 74 0f 85 57 RSP: 002b:00007f04fac73188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fffb2c0f55f R14: 00007f04fac73300 R15: 0000000000022000 INFO: task syz-executor.4:13218 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28856 13218 8463 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x430 drivers/tty/vt/selection.c:372 tioclinux+0xfb/0x390 drivers/tty/vt/vt.c:3055 vt_ioctl+0x19f8/0x2200 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x456/0x1290 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: 61 73 75 96 80 79 04 68 75 90 b8 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 30 81 39 73 69 6e 67 75 0e 66 <81> 79 04 6c 65 66 90 0f 84 0f ff ff ff 81 39 73 79 73 74 0f 85 57 RSP: 002b:00007f7bec878188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff0d690adf R14: 00007f7bec878300 R15: 0000000000022000 INFO: task syz-executor.5:13227 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28856 13227 8459 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x430 drivers/tty/vt/selection.c:372 tioclinux+0xfb/0x390 drivers/tty/vt/vt.c:3055 vt_ioctl+0x19f8/0x2200 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x456/0x1290 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: 61 73 75 96 80 79 04 68 75 90 b8 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 30 81 39 73 69 6e 67 75 0e 66 <81> 79 04 6c 65 66 90 0f 84 0f ff ff ff 81 39 73 79 73 74 0f 85 57 RSP: 002b:00007fbea7e1d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff6a3aabdf R14: 00007fbea7e1d300 R15: 0000000000022000 INFO: task syz-executor.3:13235 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28760 13235 8461 0x00000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x430 drivers/tty/vt/selection.c:372 tioclinux+0xfb/0x390 drivers/tty/vt/vt.c:3055 vt_ioctl+0x19f8/0x2200 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x456/0x1290 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: 61 73 75 96 80 79 04 68 75 90 b8 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 30 81 39 73 69 6e 67 75 0e 66 <81> 79 04 6c 65 66 90 0f 84 0f ff ff ff 81 39 73 79 73 74 0f 85 57 RSP: 002b:00007f63fe6b7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fffc9f16f9f R14: 00007f63fe6b7300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1569: #0: 00000000430c5d7e (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4443 2 locks held by login/12575: #0: 000000004b082073 (&tty->legacy_mutex){+.+.}, at: tty_lock+0x4d/0x70 drivers/tty/tty_mutex.c:19 #1: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_write+0x2d/0x40 drivers/tty/tty_ldsem.c:388 2 locks held by syz-executor.0/13167: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.2/13171: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.4/13178: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.5/13185: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.3/13192: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.1/13197: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.0/13203: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.2/13211: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.4/13218: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.5/13227: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.3/13235: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.1/13241: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.0/13249: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.2/13257: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.4/13265: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.5/13273: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.3/13279: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.1/13289: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.0/13295: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.2/13301: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.4/13350: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.4/13311: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.5/13319: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.3/13327: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.1/13334: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.0/13341: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.2/13349: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.5/13360: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.3/13367: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.1/13374: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.0/13382: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.2/13389: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.5/13417: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.5/13398: #0: 00000000f42d28f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000388dc38a (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1569 Comm: khungtaskd Not tainted 4.19.196-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/0x226 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf6/0x120 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+0x347/0x410 kernel/kthread.c:259 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 skipped: idling at native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:60