INFO: task syz-executor.4:26727 blocked for more than 143 seconds. Not tainted 5.2.0+ #67 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28856 26727 6348 0x00004004 Call Trace: context_switch /kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 /kernel/sched/core.c:3880 schedule+0xa8/0x270 /kernel/sched/core.c:3944 schedule_timeout+0x717/0xc50 /kernel/time/timer.c:1783 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+0x29c/0x440 /kernel/sched/completion.c:136 crypto_wait_req /./include/linux/crypto.h:685 [inline] _aead_recvmsg /crypto/algif_aead.c:309 [inline] aead_recvmsg+0x11e3/0x16a0 /crypto/algif_aead.c:330 sock_recvmsg_nosec+0x89/0xb0 /net/socket.c:871 ___sys_recvmsg+0x271/0x5a0 /net/socket.c:2480 do_recvmmsg+0x27e/0x7a0 /net/socket.c:2601 __sys_recvmmsg+0x259/0x270 /net/socket.c:2680 __do_sys_recvmmsg /net/socket.c:2703 [inline] __se_sys_recvmmsg /net/socket.c:2696 [inline] __x64_sys_recvmmsg+0xe6/0x140 /net/socket.c:2696 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: 9b 00 00 00 48 83 ec 68 48 89 6c 24 60 48 8d 6c 24 60 48 8b 42 08 48 8b 4a 10 48 8b 5a 18 48 8b 72 20 48 8b 7a 28 48 8b 3f 4c <8b> 42 30 48 8b 52 38 48 85 d2 76 62 48 89 44 24 58 4c 89 44 24 28 RSP: 002b:00007fbb554e1c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459819 RDX: 0000000000000134 RSI: 00000000200016c0 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbb554e26d4 R13: 00000000004c6bf7 R14: 00000000004dbd88 R15: 00000000ffffffff INFO: task syz-executor.4:26785 blocked for more than 143 seconds. Not tainted 5.2.0+ #67 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28984 26785 6348 0x00004004 Call Trace: context_switch /kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 /kernel/sched/core.c:3880 schedule+0xa8/0x270 /kernel/sched/core.c:3944 schedule_timeout+0x717/0xc50 /kernel/time/timer.c:1783 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+0x29c/0x440 /kernel/sched/completion.c:136 crypto_wait_req /./include/linux/crypto.h:685 [inline] _aead_recvmsg /crypto/algif_aead.c:309 [inline] aead_recvmsg+0x11e3/0x16a0 /crypto/algif_aead.c:330 sock_recvmsg_nosec+0x89/0xb0 /net/socket.c:871 ___sys_recvmsg+0x271/0x5a0 /net/socket.c:2480 do_recvmmsg+0x27e/0x7a0 /net/socket.c:2601 __sys_recvmmsg+0x259/0x270 /net/socket.c:2680 __do_sys_recvmmsg /net/socket.c:2703 [inline] __se_sys_recvmmsg /net/socket.c:2696 [inline] __x64_sys_recvmmsg+0xe6/0x140 /net/socket.c:2696 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: 9b 00 00 00 48 83 ec 68 48 89 6c 24 60 48 8d 6c 24 60 48 8b 42 08 48 8b 4a 10 48 8b 5a 18 48 8b 72 20 48 8b 7a 28 48 8b 3f 4c <8b> 42 30 48 8b 52 38 48 85 d2 76 62 48 89 44 24 58 4c 89 44 24 28 RSP: 002b:00007fbb5549fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459819 RDX: 0000000000000134 RSI: 00000000200016c0 RDI: 0000000000000004 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbb554a06d4 R13: 00000000004c6bf7 R14: 00000000004dbd88 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1053: #0: 0000000066f1e474 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e /kernel/locking/lockdep.c:5257 2 locks held by getty/9411: #0: 00000000594257a1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000004b61fba7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9412: #0: 00000000d94c493a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000c6489601 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9413: #0: 0000000000dcc05e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000cc7853bf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9414: #0: 00000000f5b9d5db (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000020698090 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9415: #0: 00000000b6b73dfb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000002b5cad4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9416: #0: 00000000269e51e2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000e1876448 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9417: #0: 000000002c7e9394 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000009f5437c8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 1 lock held by syz-executor.4/26727: #0: 00000000955d9ec6 (sk_lock-AF_ALG){+.+.}, at: lock_sock /./include/net/sock.h:1522 [inline] #0: 00000000955d9ec6 (sk_lock-AF_ALG){+.+.}, at: aead_recvmsg+0xbb/0x16a0 /crypto/algif_aead.c:328 1 lock held by syz-executor.4/26785: #0: 00000000cccd0fe9 (sk_lock-AF_ALG){+.+.}, at: lock_sock /./include/net/sock.h:1522 [inline] #0: 00000000cccd0fe9 (sk_lock-AF_ALG){+.+.}, at: aead_recvmsg+0xbb/0x16a0 /crypto/algif_aead.c:328 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1053 Comm: khungtaskd Not tainted 5.2.0+ #67 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+0x172/0x1f0 /lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 /lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b /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:205 [inline] watchdog+0x9d0/0xef0 /kernel/hung_task.c:289 kthread+0x361/0x430 /kernel/kthread.c:255 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 /./arch/x86/include/asm/irqflags.h:60