INFO: task syz-executor.5:10246 blocked for more than 140 seconds. Not tainted 4.19.48 #20 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28760 10246 9377 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80d/0x1c70 kernel/sched/core.c:3474 schedule+0x92/0x1c0 kernel/sched/core.c:3518 schedule_timeout+0x8c8/0xfc0 kernel/time/timer.c:1780 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:517 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x143f/0x1a80 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg net/socket.c:802 [inline] sock_recvmsg+0xce/0x110 net/socket.c:798 ___sys_recvmsg+0x271/0x580 net/socket.c:2277 __sys_recvmmsg+0x27e/0x790 net/socket.c:2389 do_sys_recvmmsg net/socket.c:2465 [inline] do_sys_recvmmsg+0x181/0x1a0 net/socket.c:2454 __do_sys_recvmmsg net/socket.c:2483 [inline] __se_sys_recvmmsg net/socket.c:2479 [inline] __x64_sys_recvmmsg+0xbe/0x150 net/socket.c:2479 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: 76 1b 48 8b 0e 48 8b 17 48 83 c6 08 48 83 c7 08 48 83 eb 08 48 39 d1 74 e3 c6 00 00 c3 48 8b 4c 1e f8 48 8b 54 1f f8 48 39 d1 <0f> 94 00 c3 48 83 fb 00 74 37 48 8d 0c dd 00 00 00 00 48 f7 d9 40 RSP: 002b:00007f6934cd4c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459279 RDX: 0000000000000001 RSI: 0000000020002ec0 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6934cd56d4 R13: 00000000004c6363 R14: 00000000004dadf8 R15: 00000000ffffffff INFO: task syz-executor.5:10392 blocked for more than 140 seconds. Not tainted 4.19.48 #20 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29096 10392 9377 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80d/0x1c70 kernel/sched/core.c:3474 schedule+0x92/0x1c0 kernel/sched/core.c:3518 schedule_timeout+0x8c8/0xfc0 kernel/time/timer.c:1780 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:517 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x143f/0x1a80 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg net/socket.c:802 [inline] sock_recvmsg+0xce/0x110 net/socket.c:798 ___sys_recvmsg+0x271/0x580 net/socket.c:2277 __sys_recvmmsg+0x27e/0x790 net/socket.c:2389 do_sys_recvmmsg net/socket.c:2465 [inline] do_sys_recvmmsg+0x181/0x1a0 net/socket.c:2454 __do_sys_recvmmsg net/socket.c:2483 [inline] __se_sys_recvmmsg net/socket.c:2479 [inline] __x64_sys_recvmmsg+0xbe/0x150 net/socket.c:2479 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: 76 1b 48 8b 0e 48 8b 17 48 83 c6 08 48 83 c7 08 48 83 eb 08 48 39 d1 74 e3 c6 00 00 c3 48 8b 4c 1e f8 48 8b 54 1f f8 48 39 d1 <0f> 94 00 c3 48 83 fb 00 74 37 48 8d 0c dd 00 00 00 00 48 f7 d9 40 RSP: 002b:00007f6934c71c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459279 RDX: 0000000000000001 RSI: 0000000020002ec0 RDI: 0000000000000004 RBP: 000000000075c100 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6934c726d4 R13: 00000000004c6363 R14: 00000000004dadf8 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1034: #0: 00000000e2282787 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4435 1 lock held by rsyslogd/7823: #0: 0000000019a1f56f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/7944: #0: 000000009fc3f605 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000f8fbdcaf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7945: #0: 000000008006b0a9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000b1cbca5e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7946: #0: 0000000039503c38 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 0000000092626a64 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7947: #0: 0000000055ee1fdf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000b90fb135 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7948: #0: 00000000fc0e5177 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000003070c8c1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7949: #0: 00000000b69ab013 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000009eddaa44 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7950: #0: 000000003be5ee65 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000256dd276 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 1 lock held by syz-executor.5/10246: #0: 000000006e1c48c4 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1501 [inline] #0: 000000006e1c48c4 (sk_lock-AF_ALG){+.+.}, at: aead_recvmsg+0xbb/0x1a80 crypto/algif_aead.c:332 1 lock held by syz-executor.5/10392: #0: 00000000999bab09 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1501 [inline] #0: 00000000999bab09 (sk_lock-AF_ALG){+.+.}, at: aead_recvmsg+0xbb/0x1a80 crypto/algif_aead.c:332 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1034 Comm: khungtaskd Not tainted 4.19.48 #20 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+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 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+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 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+0xe/0x10 arch/x86/include/asm/irqflags.h:60