bisecting fixing commit since c98875d930e915d01e8c40c7d3c16f00b3c8abe1 building syzkaller on 53199d6e8aee5f0ebd3775d2b1c674f4e6e64e2b testing commit c98875d930e915d01e8c40c7d3c16f00b3c8abe1 with gcc (GCC) 8.1.0 kernel signature: 74b5a88fa4a6f4b7944bbf2a83f1b115c87537aaee41ed1dde60ea2d521b5c5e all runs: crashed: INFO: task hung in aead_recvmsg testing current HEAD a083db76118d20d070794ecf79af17843406c3f6 testing commit a083db76118d20d070794ecf79af17843406c3f6 with gcc (GCC) 8.1.0 kernel signature: e9e18e3a0ca54188b35b9f946d57bea256f90608a3c6a5d9128abebbd75e22b2 all runs: crashed: INFO: task hung in aead_recvmsg revisions tested: 2, total time: 32m40.739884776s (build: 19m38.288761263s, test: 12m8.574177611s) the crash still happens on HEAD commit msg: Linux 4.19.107 crash: INFO: task hung in aead_recvmsg IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 INFO: task syz-executor.3:7338 blocked for more than 140 seconds. Not tainted 4.19.107-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27784 7338 7290 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x6d7/0xda0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x282/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:517 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x1182/0x1fb0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg+0xb9/0xf0 net/socket.c:802 sock_read_iter+0x252/0x430 net/socket.c:879 call_read_iter include/linux/fs.h:1814 [inline] do_iter_readv_writev+0x3f2/0x960 fs/read_write.c:679 do_iter_read+0x1db/0x580 fs/read_write.c:923 vfs_readv+0xc9/0x130 fs/read_write.c:987 do_readv+0x110/0x330 fs/read_write.c:1020 __do_sys_readv fs/read_write.c:1107 [inline] __se_sys_readv fs/read_write.c:1104 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1104 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 08 48 c7 44 24 10 04 00 00 00 e8 62 d8 fa ff 48 8b 44 24 18 48 8b 4c 24 30 48 83 c1 08 48 89 0c 24 48 89 44 24 08 48 c7 44 24 <10> 10 00 00 00 e8 3d d8 fa ff 48 8b 44 24 18 48 89 44 24 40 48 8b RSP: 002b:00007fc07639ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc07639b6d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.5:7342 blocked for more than 140 seconds. Not tainted 4.19.107-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27768 7342 7286 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x6d7/0xda0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x282/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:517 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x1182/0x1fb0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg+0xb9/0xf0 net/socket.c:802 sock_read_iter+0x252/0x430 net/socket.c:879 call_read_iter include/linux/fs.h:1814 [inline] do_iter_readv_writev+0x3f2/0x960 fs/read_write.c:679 do_iter_read+0x1db/0x580 fs/read_write.c:923 vfs_readv+0xc9/0x130 fs/read_write.c:987 do_readv+0x110/0x330 fs/read_write.c:1020 __do_sys_readv fs/read_write.c:1107 [inline] __se_sys_readv fs/read_write.c:1104 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1104 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 08 48 c7 44 24 10 04 00 00 00 e8 62 d8 fa ff 48 8b 44 24 18 48 8b 4c 24 30 48 83 c1 08 48 89 0c 24 48 89 44 24 08 48 c7 44 24 <10> 10 00 00 00 e8 3d d8 fa ff 48 8b 44 24 18 48 89 44 24 40 48 8b RSP: 002b:00007f6953b6ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6953b6b6d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.2:7351 blocked for more than 140 seconds. Not tainted 4.19.107-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28808 7351 7293 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x6d7/0xda0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x282/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:517 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x1182/0x1fb0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg+0xb9/0xf0 net/socket.c:802 sock_read_iter+0x252/0x430 net/socket.c:879 call_read_iter include/linux/fs.h:1814 [inline] do_iter_readv_writev+0x3f2/0x960 fs/read_write.c:679 do_iter_read+0x1db/0x580 fs/read_write.c:923 vfs_readv+0xc9/0x130 fs/read_write.c:987 do_readv+0x110/0x330 fs/read_write.c:1020 __do_sys_readv fs/read_write.c:1107 [inline] __se_sys_readv fs/read_write.c:1104 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1104 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 08 48 c7 44 24 10 04 00 00 00 e8 62 d8 fa ff 48 8b 44 24 18 48 8b 4c 24 30 48 83 c1 08 48 89 0c 24 48 89 44 24 08 48 c7 44 24 <10> 10 00 00 00 e8 3d d8 fa ff 48 8b 44 24 18 48 89 44 24 40 48 8b RSP: 002b:00007fbc61847c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbc618486d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.2:7355 blocked for more than 140 seconds. Not tainted 4.19.107-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28344 7355 7293 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x6d7/0xda0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x282/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:517 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x1182/0x1fb0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg+0xb9/0xf0 net/socket.c:802 sock_read_iter+0x252/0x430 net/socket.c:879 call_read_iter include/linux/fs.h:1814 [inline] do_iter_readv_writev+0x3f2/0x960 fs/read_write.c:679 do_iter_read+0x1db/0x580 fs/read_write.c:923 vfs_readv+0xc9/0x130 fs/read_write.c:987 do_readv+0x110/0x330 fs/read_write.c:1020 __do_sys_readv fs/read_write.c:1107 [inline] __se_sys_readv fs/read_write.c:1104 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1104 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 08 48 c7 44 24 10 04 00 00 00 e8 62 d8 fa ff 48 8b 44 24 18 48 8b 4c 24 30 48 83 c1 08 48 89 0c 24 48 89 44 24 08 48 c7 44 24 <10> 10 00 00 00 e8 3d d8 fa ff 48 8b 44 24 18 48 89 44 24 40 48 8b RSP: 002b:00007fbc61826c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbc618276d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.1:7353 blocked for more than 140 seconds. Not tainted 4.19.107-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28808 7353 7284 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x6d7/0xda0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x282/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:517 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x1182/0x1fb0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg+0xb9/0xf0 net/socket.c:802 sock_read_iter+0x252/0x430 net/socket.c:879 call_read_iter include/linux/fs.h:1814 [inline] do_iter_readv_writev+0x3f2/0x960 fs/read_write.c:679 do_iter_read+0x1db/0x580 fs/read_write.c:923 vfs_readv+0xc9/0x130 fs/read_write.c:987 do_readv+0x110/0x330 fs/read_write.c:1020 __do_sys_readv fs/read_write.c:1107 [inline] __se_sys_readv fs/read_write.c:1104 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1104 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 08 48 c7 44 24 10 04 00 00 00 e8 62 d8 fa ff 48 8b 44 24 18 48 8b 4c 24 30 48 83 c1 08 48 89 0c 24 48 89 44 24 08 48 c7 44 24 <10> 10 00 00 00 e8 3d d8 fa ff 48 8b 44 24 18 48 89 44 24 40 48 8b RSP: 002b:00007f896d149c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f896d14a6d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.1:7356 blocked for more than 140 seconds. Not tainted 4.19.107-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28344 7356 7284 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x6d7/0xda0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x282/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:517 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x1182/0x1fb0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg+0xb9/0xf0 net/socket.c:802 sock_read_iter+0x252/0x430 net/socket.c:879 call_read_iter include/linux/fs.h:1814 [inline] do_iter_readv_writev+0x3f2/0x960 fs/read_write.c:679 do_iter_read+0x1db/0x580 fs/read_write.c:923 vfs_readv+0xc9/0x130 fs/read_write.c:987 do_readv+0x110/0x330 fs/read_write.c:1020 __do_sys_readv fs/read_write.c:1107 [inline] __se_sys_readv fs/read_write.c:1104 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1104 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 08 48 c7 44 24 10 04 00 00 00 e8 62 d8 fa ff 48 8b 44 24 18 48 8b 4c 24 30 48 83 c1 08 48 89 0c 24 48 89 44 24 08 48 c7 44 24 <10> 10 00 00 00 e8 3d d8 fa ff 48 8b 44 24 18 48 89 44 24 40 48 8b RSP: 002b:00007f896d128c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f896d1296d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.4:7363 blocked for more than 140 seconds. Not tainted 4.19.107-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28808 7363 7288 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x6d7/0xda0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x282/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:517 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x1182/0x1fb0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg+0xb9/0xf0 net/socket.c:802 sock_read_iter+0x252/0x430 net/socket.c:879 call_read_iter include/linux/fs.h:1814 [inline] do_iter_readv_writev+0x3f2/0x960 fs/read_write.c:679 do_iter_read+0x1db/0x580 fs/read_write.c:923 vfs_readv+0xc9/0x130 fs/read_write.c:987 do_readv+0x110/0x330 fs/read_write.c:1020 __do_sys_readv fs/read_write.c:1107 [inline] __se_sys_readv fs/read_write.c:1104 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1104 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 08 48 c7 44 24 10 04 00 00 00 e8 62 d8 fa ff 48 8b 44 24 18 48 8b 4c 24 30 48 83 c1 08 48 89 0c 24 48 89 44 24 08 48 c7 44 24 <10> 10 00 00 00 e8 3d d8 fa ff 48 8b 44 24 18 48 89 44 24 40 48 8b RSP: 002b:00007f9633cc7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9633cc86d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.0:7366 blocked for more than 140 seconds. Not tainted 4.19.107-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28808 7366 7292 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x6d7/0xda0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x282/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:517 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x1182/0x1fb0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg+0xb9/0xf0 net/socket.c:802 sock_read_iter+0x252/0x430 net/socket.c:879 call_read_iter include/linux/fs.h:1814 [inline] do_iter_readv_writev+0x3f2/0x960 fs/read_write.c:679 do_iter_read+0x1db/0x580 fs/read_write.c:923 vfs_readv+0xc9/0x130 fs/read_write.c:987 do_readv+0x110/0x330 fs/read_write.c:1020 __do_sys_readv fs/read_write.c:1107 [inline] __se_sys_readv fs/read_write.c:1104 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1104 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 08 48 c7 44 24 10 04 00 00 00 e8 62 d8 fa ff 48 8b 44 24 18 48 8b 4c 24 30 48 83 c1 08 48 89 0c 24 48 89 44 24 08 48 c7 44 24 <10> 10 00 00 00 e8 3d d8 fa ff 48 8b 44 24 18 48 89 44 24 40 48 8b RSP: 002b:00007fa5263c9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa5263ca6d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1036: #0: 00000000d2f78e4a (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4438 2 locks held by getty/7168: #0: 00000000c5d7d1bd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000299ebbc5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/7169: #0: 000000005e0d26f7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000005d05efe7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/7170: #0: 00000000615d7bcc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000001f070bca (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/7171: #0: 00000000d106be56 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000df2dadf7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/7172: #0: 0000000015d10652 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000049b106e1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/7173: #0: 00000000764de9da (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000c75da282 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/7174: #0: 0000000024432de5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000e8dabcb0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 1 lock held by syz-executor.3/7338: #0: 000000003d665978 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1506 [inline] #0: 000000003d665978 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.5/7342: #0: 00000000a824878f (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1506 [inline] #0: 00000000a824878f (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.2/7351: #0: 000000009f3d3f96 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1506 [inline] #0: 000000009f3d3f96 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.2/7355: #0: 0000000080db42d5 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1506 [inline] #0: 0000000080db42d5 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.1/7353: #0: 00000000c07c0fc3 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1506 [inline] #0: 00000000c07c0fc3 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.1/7356: #0: 0000000022f5d9e8 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1506 [inline] #0: 0000000022f5d9e8 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.4/7363: #0: 00000000f1dff541 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1506 [inline] #0: 00000000f1dff541 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.0/7366: #0: 00000000b8bdd933 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1506 [inline] #0: 00000000b8bdd933 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1036 Comm: khungtaskd Not tainted 4.19.107-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+0x123/0x177 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.4+0x3e/0x76 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xe6/0x11a 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+0x327/0x3f0 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:60