bisecting fixing commit since c98875d930e915d01e8c40c7d3c16f00b3c8abe1 building syzkaller on 53199d6e8aee5f0ebd3775d2b1c674f4e6e64e2b testing commit c98875d930e915d01e8c40c7d3c16f00b3c8abe1 with gcc (GCC) 8.1.0 kernel signature: 56211a2169495e4fb95dd8cd9057739543aec837f1bd6cd90afc9ece6300dfe6 all runs: crashed: INFO: task hung in aead_recvmsg testing current HEAD c4ff839de17f38b0ae0f8983b5c5186f8a389238 testing commit c4ff839de17f38b0ae0f8983b5c5186f8a389238 with gcc (GCC) 8.1.0 kernel signature: c2facaa352a1d05361b70de67ff7a4d0db5c7329c8a92c2fffa8d3ef438041de all runs: crashed: INFO: task hung in aead_recvmsg revisions tested: 2, total time: 35m40.03382422s (build: 21m7.363644665s, test: 13m39.209396953s) the crash still happens on HEAD commit msg: Linux 4.19.171 crash: INFO: task hung in aead_recvmsg 8021q: adding VLAN 0 to HW filter on device batadv0 IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 8021q: adding VLAN 0 to HW filter on device batadv0 INFO: task syz-executor.5:6651 blocked for more than 140 seconds. Not tainted 4.19.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28344 6651 5693 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x6e3/0xe00 kernel/time/timer.c:1794 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:314 [inline] aead_recvmsg+0x1144/0x1fb0 crypto/algif_aead.c:335 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:1815 [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: 0033:0x458ca9 Code: Bad RIP value. RSP: 002b:00007f13807b7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458ca9 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f13807b86d4 R13: 00000000004c5a05 R14: 00000000004da060 R15: 00000000ffffffff INFO: task syz-executor.0:6661 blocked for more than 140 seconds. Not tainted 4.19.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28120 6661 5690 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x6e3/0xe00 kernel/time/timer.c:1794 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:314 [inline] aead_recvmsg+0x1144/0x1fb0 crypto/algif_aead.c:335 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:1815 [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: 0033:0x458ca9 Code: Bad RIP value. RSP: 002b:00007f2dd91c1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458ca9 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2dd91c26d4 R13: 00000000004c5a05 R14: 00000000004da060 R15: 00000000ffffffff INFO: task syz-executor.2:6671 blocked for more than 140 seconds. Not tainted 4.19.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27880 6671 5697 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x6e3/0xe00 kernel/time/timer.c:1794 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:314 [inline] aead_recvmsg+0x1144/0x1fb0 crypto/algif_aead.c:335 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:1815 [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: 0033:0x458ca9 Code: Bad RIP value. RSP: 002b:00007f8d69100c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458ca9 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8d691016d4 R13: 00000000004c5a05 R14: 00000000004da060 R15: 00000000ffffffff INFO: task syz-executor.1:6681 blocked for more than 140 seconds. Not tainted 4.19.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D27656 6681 5691 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x6e3/0xe00 kernel/time/timer.c:1794 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:314 [inline] aead_recvmsg+0x1144/0x1fb0 crypto/algif_aead.c:335 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:1815 [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: 0033:0x458ca9 Code: Bad RIP value. RSP: 002b:00007fbef15fac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458ca9 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbef15fb6d4 R13: 00000000004c5a05 R14: 00000000004da060 R15: 00000000ffffffff INFO: task syz-executor.1:6683 blocked for more than 140 seconds. Not tainted 4.19.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D26952 6683 5691 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x6e3/0xe00 kernel/time/timer.c:1794 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:314 [inline] aead_recvmsg+0x1144/0x1fb0 crypto/algif_aead.c:335 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:1815 [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: 0033:0x458ca9 Code: Bad RIP value. RSP: 002b:00007fbef15d9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458ca9 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbef15da6d4 R13: 00000000004c5a05 R14: 00000000004da060 R15: 00000000ffffffff INFO: task syz-executor.4:6685 blocked for more than 140 seconds. Not tainted 4.19.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27656 6685 5683 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x6e3/0xe00 kernel/time/timer.c:1794 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:314 [inline] aead_recvmsg+0x1144/0x1fb0 crypto/algif_aead.c:335 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:1815 [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: 0033:0x458ca9 Code: Bad RIP value. RSP: 002b:00007f4b510c8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458ca9 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4b510c96d4 R13: 00000000004c5a05 R14: 00000000004da060 R15: 00000000ffffffff INFO: task syz-executor.3:6693 blocked for more than 140 seconds. Not tainted 4.19.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27416 6693 5687 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x6e3/0xe00 kernel/time/timer.c:1794 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:314 [inline] aead_recvmsg+0x1144/0x1fb0 crypto/algif_aead.c:335 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:1815 [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: 0033:0x458ca9 Code: Bad RIP value. RSP: 002b:00007f4f16e06c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458ca9 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4f16e076d4 R13: 00000000004c5a05 R14: 00000000004da060 R15: 00000000ffffffff INFO: task syz-executor.3:6702 blocked for more than 140 seconds. Not tainted 4.19.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D26952 6702 5687 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x6e3/0xe00 kernel/time/timer.c:1794 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:314 [inline] aead_recvmsg+0x1144/0x1fb0 crypto/algif_aead.c:335 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:1815 [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: 0033:0x458ca9 Code: Bad RIP value. RSP: 002b:00007f4f16de5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458ca9 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4f16de66d4 R13: 00000000004c5a05 R14: 00000000004da060 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1040: #0: 0000000042e890c9 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4442 1 lock held by in:imklog/5313: #0: 000000003453c2c4 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 2 locks held by rs:main Q:Reg/5314: #0: 00000000a418ed75 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1824 [inline] #0: 00000000a418ed75 (&rq->lock){-.-.}, at: __schedule+0x1f5/0x1c20 kernel/sched/core.c:3455 #1: 0000000042e890c9 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 0000000042e890c9 (rcu_read_lock){....}, at: update_curr+0x2e1/0x890 kernel/sched/fair.c:857 1 lock held by syz-executor.5/6651: #0: 0000000071d2ef63 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1510 [inline] #0: 0000000071d2ef63 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.0/6661: #0: 000000003e8191fc (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1510 [inline] #0: 000000003e8191fc (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.2/6671: #0: 00000000d562529a (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1510 [inline] #0: 00000000d562529a (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.1/6681: #0: 0000000095653aba (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1510 [inline] #0: 0000000095653aba (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.1/6683: #0: 00000000060176f4 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1510 [inline] #0: 00000000060176f4 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.4/6685: #0: 0000000017fe50e9 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1510 [inline] #0: 0000000017fe50e9 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.3/6693: #0: 0000000091e99505 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1510 [inline] #0: 0000000091e99505 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1b3/0x440 crypto/af_alg.c:774 1 lock held by syz-executor.3/6702: #0: 00000000df95d151 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1510 [inline] #0: 00000000df95d151 (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: 1040 Comm: khungtaskd Not tainted 4.19.171-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+0x123/0x171 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.4+0x3e/0x76 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xe6/0x120 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+0x34a/0x410 kernel/kthread.c:259 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 CPU: 1 PID: 3290 Comm: systemd-journal Not tainted 4.19.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x1f2/0x4980 kernel/locking/lockdep.c:3294 Code: 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 28 32 00 00 49 81 7d 00 60 21 0b 89 <0f> 84 4a ff ff ff 83 fe 01 0f 87 4d ff ff ff 48 b8 00 00 00 00 00 RSP: 0018:ffff8881decafc60 EFLAGS: 00000006 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 1ffffffff1033374 RSI: 0000000000000000 RDI: ffffffff88120240 RBP: ffff8881decafe48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff88199ba0 R14: ffff8881deca6540 R15: 0000000000000002 FS: 00007f6b3975d8c0(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6b36b48000 CR3: 00000001df1c6006 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x173/0x3d0 kernel/locking/lockdep.c:3907 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] __task_pid_nr_ns+0x3b/0x3f0 kernel/pid.c:427 task_tgid_vnr include/linux/sched.h:1303 [inline] __ia32_sys_getpid+0x19/0x20 kernel/sys.c:890 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f6b389f6f17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffe1dee74d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 0000560588223200 RCX: 00007f6b389f6f17 RDX: 00007ffe1dee7598 RSI: 0000000000000001 RDI: 0000560588223200 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000202 R12: 00007ffe1dee7598 R13: 0000000000000cda R14: 00007ffe1deea380 R15: 00007ffe1dee7990