INFO: task syz-executor.2:23040 blocked for more than 143 seconds. Not tainted 5.2.0-rc6+ #50 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28832 23040 18090 0x00000004 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3445 schedule+0xa8/0x260 kernel/sched/core.c:3509 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:675 [inline] _aead_recvmsg crypto/algif_aead.c:309 [inline] aead_recvmsg+0x1480/0x1aa0 crypto/algif_aead.c:330 sock_recvmsg_nosec+0x89/0xb0 net/socket.c:877 ___sys_recvmsg+0x271/0x5a0 net/socket.c:2448 do_recvmmsg+0x27e/0x7a0 net/socket.c:2561 __sys_recvmmsg+0x259/0x270 net/socket.c:2640 __do_sys_recvmmsg net/socket.c:2663 [inline] __se_sys_recvmmsg net/socket.c:2656 [inline] __x64_sys_recvmmsg+0xe6/0x140 net/socket.c:2656 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: 48 89 98 e0 00 00 00 c7 04 24 00 00 00 00 48 8d 05 f4 2a 53 00 48 89 44 24 08 e8 72 0c fd ff 85 c0 0f 85 1c 02 00 00 48 8b 05 70 76 00 48 89 44 24 28 31 c0 eb 03 48 ff c0 48 83 f8 41 7d 5a RSP: 002b:00007f01e1010c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459519 RDX: 0000000000000002 RSI: 0000000020000e40 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f01e10116d4 R13: 00000000004c6860 R14: 00000000004db8b8 R15: 00000000ffffffff INFO: task syz-executor.2:23042 blocked for more than 143 seconds. Not tainted 5.2.0-rc6+ #50 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28832 23042 18090 0x00000004 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3445 schedule+0xa8/0x260 kernel/sched/core.c:3509 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:675 [inline] _aead_recvmsg crypto/algif_aead.c:309 [inline] aead_recvmsg+0x1480/0x1aa0 crypto/algif_aead.c:330 sock_recvmsg_nosec+0x89/0xb0 net/socket.c:877 ___sys_recvmsg+0x271/0x5a0 net/socket.c:2448 do_recvmmsg+0x27e/0x7a0 net/socket.c:2561 __sys_recvmmsg+0x259/0x270 net/socket.c:2640 __do_sys_recvmmsg net/socket.c:2663 [inline] __se_sys_recvmmsg net/socket.c:2656 [inline] __x64_sys_recvmmsg+0xe6/0x140 net/socket.c:2656 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: 48 89 98 e0 00 00 00 c7 04 24 00 00 00 00 48 8d 05 f4 2a 53 00 48 89 44 24 08 e8 72 0c fd ff 85 c0 0f 85 1c 02 00 00 48 8b 05 70 76 00 48 89 44 24 28 31 c0 eb 03 48 ff c0 48 83 f8 41 7d 5a RSP: 002b:00007f01e0fefc78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459519 RDX: 0000000000000002 RSI: 0000000020000e40 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f01e0ff06d4 R13: 00000000004c6860 R14: 00000000004db8b8 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1044: #0: 00000000def3dbf3 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5149 2 locks held by getty/8797: #0: 000000001c60b26b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000608b4201 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8798: #0: 00000000ac3f8f7d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a6d99744 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8799: #0: 00000000ea8e5211 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000024893457 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8800: #0: 000000000ea6f25a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000bdb39dae (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8801: #0: 000000003cc74dbb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000008187533 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8802: #0: 00000000ececdbdc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000003dca3b1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8803: #0: 00000000afbccd7f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000000f1d8437 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.2/23040: #0: 000000006ba146c5 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1522 [inline] #0: 000000006ba146c5 (sk_lock-AF_ALG){+.+.}, at: aead_recvmsg+0xbb/0x1aa0 crypto/algif_aead.c:328 1 lock held by syz-executor.2/23042: #0: 000000006d423abf (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1522 [inline] #0: 000000006d423abf (sk_lock-AF_ALG){+.+.}, at: aead_recvmsg+0xbb/0x1aa0 crypto/algif_aead.c:328 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1044 Comm: khungtaskd Not tainted 5.2.0-rc6+ #50 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:205 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:289 kthread+0x354/0x420 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 CPU: 0 PID: 4233 Comm: kworker/u4:11 Not tainted 5.2.0-rc6+ #50 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:rcu_dynticks_curr_cpu_in_eqs+0x88/0xb0 kernel/rcu/tree.c:292 Code: fc ff df 48 c1 ea 03 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 17 8b 83 b8 00 00 00 48 83 c4 08 5b 41 5c 5d e8 83 f0 01 83 e0 01 c3 4c 89 e7 e8 67 3c 4b 00 eb df 48 89 45 RSP: 0018:ffff88805fc2fcc8 EFLAGS: 00000292 RAX: 000000000008ed8a RBX: ffff88809bdfa580 RCX: ffffffff815ec694 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ae8363b8 RBP: ffff88805fc2fcd0 R08: 1ffff11015d06c77 R09: ffffed1015d06c78 R10: ffffed1015d06c77 R11: ffff8880ae8363bb R12: 0000000000000000 R13: 0000000000000281 R14: ffff8880872529c8 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000931d5000 CR4: 00000000001406f0 Call Trace: rcu_read_lock include/linux/rcupdate.h:594 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:407 [inline] batadv_nc_worker+0x4cd/0x760 net/batman-adv/network-coding.c:718 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352