INFO: task syz-executor274:7726 blocked for more than 143 seconds. Not tainted 5.1.0-rc5-next-20190416 #26 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor274 D28096 7726 7702 0x00000004 Call Trace: context_switch kernel/sched/core.c:2876 [inline] __schedule+0x813/0x1cc0 kernel/sched/core.c:3517 schedule+0x92/0x180 kernel/sched/core.c:3561 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:680 [inline] _aead_recvmsg crypto/algif_aead.c:313 [inline] aead_recvmsg+0x1492/0x1ab0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:881 [inline] sock_recvmsg net/socket.c:888 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:884 sock_read_iter+0x299/0x3b0 net/socket.c:966 call_read_iter include/linux/fs.h:1860 [inline] do_iter_readv_writev+0x700/0x8e0 fs/read_write.c:679 do_iter_read+0x27c/0x660 fs/read_write.c:920 vfs_readv+0xf0/0x160 fs/read_write.c:984 do_readv+0x15e/0x370 fs/read_write.c:1017 __do_sys_readv fs/read_write.c:1104 [inline] __se_sys_readv fs/read_write.c:1101 [inline] __x64_sys_readv+0x75/0xb0 fs/read_write.c:1101 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441349 Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff00b777e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 00000000004a23d8 RCX: 0000000000441349 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000004b611 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402170 R13: 0000000000402200 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1043: #0: 0000000070d10fb6 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5056 1 lock held by rsyslogd/7589: #0: 000000000abb37be (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/7679: #0: 000000008f39d7f8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007237f8b1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7680: #0: 0000000070def8f7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000088d8cc6c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7681: #0: 000000002f7bd778 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006d324d63 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7682: #0: 000000005aa4d3ae (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000008c3a12f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7683: #0: 000000000a9b6abb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007b08a8d2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7684: #0: 00000000e9f0a809 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e67bd4fa (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7685: #0: 000000009b641c92 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000bf157b62 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor274/7726: #0: 0000000078be9970 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1520 [inline] #0: 0000000078be9970 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x215/0x540 crypto/af_alg.c:764 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1043 Comm: khungtaskd Not tainted 5.1.0-rc5-next-20190416 #26 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+0x1be/0x236 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:204 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:288 kthread+0x357/0x430 kernel/kthread.c:254 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: