bisecting fixing commit since c500bee1c5b2f1d59b1081ac879d73268ab0ff17 building syzkaller on 6c236867ce33c0c16b102e02a08226d7eb9b2046 testing commit c500bee1c5b2f1d59b1081ac879d73268ab0ff17 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: f37f086530a42b0fccbf7199f77a15e621fe6e2c5f4f14548173af572ba8fbf8 run #0: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #1: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #2: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #3: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #4: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor454451335" "root@10.128.10.0:./syz-executor454451335"]: exit status 1 Connection timed out during banner exchange Connection to 10.128.10.0 port 22 timed out lost connection run #5: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor010788922" "root@10.128.10.2:./syz-executor010788922"]: exit status 1 Connection timed out during banner exchange Connection to 10.128.10.2 port 22 timed out lost connection run #6: OK run #7: OK run #8: OK run #9: OK run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK reproducer seems to be flaky testing current HEAD c9e6606c7fe92b50a02ce51dda82586ebdf99b48 testing commit c9e6606c7fe92b50a02ce51dda82586ebdf99b48 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 7ce930e3c422c888523382ab92f9959ffbdc91d3c407a09205cbb69d9af017d1 run #0: crashed: INFO: task hung in flush_to_ldisc run #1: crashed: INFO: task hung in flush_to_ldisc run #2: crashed: INFO: task hung in flush_to_ldisc run #3: crashed: INFO: task hung in flush_to_ldisc run #4: crashed: INFO: task hung in set_selection_user run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK Reproducer flagged being flaky revisions tested: 2, total time: 36m58.31611658s (build: 13m8.314342208s, test: 23m9.873605879s) the crash still happens on HEAD commit msg: Linux 5.16-rc8 crash: INFO: task hung in set_selection_user INFO: task syz-executor.0:6779 blocked for more than 143 seconds. Not tainted 5.16.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28936 pid: 6779 ppid: 6602 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0x90d/0x26e0 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 set_selection_kernel drivers/tty/vt/selection.c:357 [inline] set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x12d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007f8eb4fed188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffc134e231f R14: 00007f8eb4fed300 R15: 0000000000022000 INFO: task syz-executor.3:6773 blocked for more than 143 seconds. Not tainted 5.16.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28528 pid: 6773 ppid: 6772 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0x90d/0x26e0 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x12d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007f4d4bf91188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd56a00e5f R14: 00007f4d4bf91300 R15: 0000000000022000 INFO: task syz-executor.1:6776 blocked for more than 144 seconds. Not tainted 5.16.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28104 pid: 6776 ppid: 6601 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0x90d/0x26e0 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 set_selection_kernel drivers/tty/vt/selection.c:357 [inline] set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x12d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007fd08fb53188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe790c5b6f R14: 00007fd08fb53300 R15: 0000000000022000 INFO: task syz-executor.1:6781 blocked for more than 144 seconds. Not tainted 5.16.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28480 pid: 6781 ppid: 6601 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0x90d/0x26e0 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 set_selection_kernel drivers/tty/vt/selection.c:357 [inline] set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x12d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007fd08fb32188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffe790c5b6f R14: 00007fd08fb32300 R15: 0000000000022000 INFO: task syz-executor.1:6777 blocked for more than 144 seconds. Not tainted 5.16.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28528 pid: 6777 ppid: 6776 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0x90d/0x26e0 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x12d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007fd08fb53188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe790c5b6f R14: 00007fd08fb53300 R15: 0000000000022000 INFO: task syz-executor.4:6784 blocked for more than 144 seconds. Not tainted 5.16.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28408 pid: 6784 ppid: 6659 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0x90d/0x26e0 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 set_selection_kernel drivers/tty/vt/selection.c:357 [inline] set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x12d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007fa401ba3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fffa9662b1f R14: 00007fa401ba3300 R15: 0000000000022000 INFO: task syz-executor.1:6794 blocked for more than 145 seconds. Not tainted 5.16.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28528 pid: 6794 ppid: 6781 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0x90d/0x26e0 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x12d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007fd08fb32188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffe790c5b6f R14: 00007fd08fb32300 R15: 0000000000022000 INFO: task syz-executor.2:6814 blocked for more than 145 seconds. Not tainted 5.16.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:28104 pid: 6814 ppid: 6752 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0x90d/0x26e0 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 set_selection_kernel drivers/tty/vt/selection.c:357 [inline] set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x12d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007f27a164b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd73fd106f R14: 00007f27a164b300 R15: 0000000000022000 INFO: task syz-executor.2:6816 blocked for more than 145 seconds. Not tainted 5.16.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:28528 pid: 6816 ppid: 6752 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0x90d/0x26e0 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x12d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007f27a162a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffd73fd106f R14: 00007f27a162a300 R15: 0000000000022000 INFO: task syz-executor.2:6817 blocked for more than 145 seconds. Not tainted 5.16.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:28528 pid: 6817 ppid: 6752 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0x90d/0x26e0 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 set_selection_kernel drivers/tty/vt/selection.c:357 [inline] set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x12d0 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007f27a1609188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c0f0 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0f0 R13: 00007ffd73fd106f R14: 00007f27a1609300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/u4:0/8: #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7a4/0x1420 kernel/workqueue.c:2269 #1: ffffc90000cd7db8 ((work_completion)(&buf->work)){+.+.}-{0:0}, at: process_one_work+0x7d1/0x1420 kernel/workqueue.c:2273 #2: ffff8880212bc0b8 (&buf->lock){+.+.}-{3:3}, at: flush_to_ldisc+0x34/0x420 drivers/tty/tty_buffer.c:515 1 lock held by khungtaskd/26: #0: ffffffff8ab78b80 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 2 locks held by getty/3313: #0: ffff88814aff3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc900027962e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x9dd/0xed0 drivers/tty/n_tty.c:2113 1 lock held by syz-executor.0/6779: #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 1 lock held by syz-executor.3/6772: #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 3 locks held by syz-executor.3/6773: #0: ffff88801bf39098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:252 #1: ffff888077f520b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 1 lock held by syz-executor.1/6776: #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 1 lock held by syz-executor.1/6781: #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 3 locks held by syz-executor.1/6777: #0: ffff88807e5f8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:252 #1: ffff88807e9160b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 1 lock held by syz-executor.4/6784: #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 2 locks held by syz-executor.1/6794: #0: ffff88807e5f8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:252 #1: ffff88807e9160b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 1 lock held by syz-executor.2/6814: #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 3 locks held by syz-executor.2/6816: #0: ffff88807e0c1098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:252 #1: ffff88807da030b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 1 lock held by syz-executor.2/6817: #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 2 locks held by syz-executor.2/6819: #0: ffff88807e0c1098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:252 #1: ffff88807da030b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 1 lock held by syz-executor.5/6842: #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 2 locks held by syz-executor.5/6844: #0: ffff88807cab3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:252 #1: ffff88807d9150b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 1 lock held by syz-executor.5/6846: #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 3 locks held by syz-executor.5/6843: #0: ffff88807cab3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:252 #1: ffff88807d9150b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 3 locks held by syz-executor439/6859: #0: ffff88801bf3f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:252 #1: ffff8880212bc0b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 1 lock held by syz-executor439/6860: #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b55c128 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x30/0xc0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x11f/0x170 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0x88c/0xbf0 kernel/hung_task.c:295 kthread+0x3ab/0x480 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4096 Comm: kworker/u4:7 Not tainted 5.16.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5378 [inline] RIP: 0010:lock_is_held_type+0x90/0x140 kernel/locking/lockdep.c:5680 Code: 24 18 0a 00 00 4d 8d ac 24 20 0a 00 00 65 ff 05 f6 df 8f 77 85 c0 7f 12 e9 8a 00 00 00 83 c3 01 41 3b 9c 24 18 0a 00 00 7d 7d <48> 63 c3 48 89 ee 48 8d 04 80 4d 8d 7c c5 00 4c 89 ff e8 99 fe ff RSP: 0018:ffffc90002adfac8 EFLAGS: 00000097 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8ab78ac0 RDI: ffff8880226ae060 RBP: ffffffff8ab78ac0 R08: 0000000000000000 R09: ffffffff8c805557 R10: fffffbfff1900aaa R11: 0000000000000001 R12: ffff8880226ad640 R13: ffff8880226ae060 R14: 00000000ffffffff R15: ffff8880226ae060 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005625447ed028 CR3: 0000000064c07000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x442/0x510 kernel/locking/lockdep.c:5608 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:354 [inline] batadv_nc_purge_paths+0xc0/0x2d0 net/batman-adv/network-coding.c:446 batadv_nc_worker+0x6e0/0xd70 net/batman-adv/network-coding.c:724 process_one_work+0x87f/0x1420 kernel/workqueue.c:2298 worker_thread+0x5a6/0xf90 kernel/workqueue.c:2445 kthread+0x3ab/0x480 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 24 18 and $0x18,%al 2: 0a 00 or (%rax),%al 4: 00 4d 8d add %cl,-0x73(%rbp) 7: ac lods %ds:(%rsi),%al 8: 24 20 and $0x20,%al a: 0a 00 or (%rax),%al c: 00 65 ff add %ah,-0x1(%rbp) f: 05 f6 df 8f 77 add $0x778fdff6,%eax 14: 85 c0 test %eax,%eax 16: 7f 12 jg 0x2a 18: e9 8a 00 00 00 jmpq 0xa7 1d: 83 c3 01 add $0x1,%ebx 20: 41 3b 9c 24 18 0a 00 cmp 0xa18(%r12),%ebx 27: 00 28: 7d 7d jge 0xa7 * 2a: 48 63 c3 movslq %ebx,%rax <-- trapping instruction 2d: 48 89 ee mov %rbp,%rsi 30: 48 8d 04 80 lea (%rax,%rax,4),%rax 34: 4d 8d 7c c5 00 lea 0x0(%r13,%rax,8),%r15 39: 4c 89 ff mov %r15,%rdi 3c: e8 .byte 0xe8 3d: 99 cltd 3e: fe (bad) 3f: ff .byte 0xff