INFO: task syz-executor.1:32157 blocked for more than 143 seconds. Not tainted 5.2.0+ #64 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28016 32157 359 0x80000000 Call Trace: context_switch /kernel/sched/core.c:3254 [inline] __schedule+0x772/0x1530 /kernel/sched/core.c:3880 schedule+0xa5/0x260 /kernel/sched/core.c:3944 rwsem_down_read_slowpath+0x4bb/0xf90 /kernel/locking/rwsem.c:1079 __down_read /kernel/locking/rwsem.c:1304 [inline] down_read+0x1f4/0x3f0 /kernel/locking/rwsem.c:1447 exit_mm /kernel/exit.c:513 [inline] do_exit+0x47b/0x2e10 /kernel/exit.c:864 do_group_exit+0x135/0x360 /kernel/exit.c:981 __do_sys_exit_group /kernel/exit.c:992 [inline] __se_sys_exit_group /kernel/exit.c:990 [inline] __x64_sys_exit_group+0x44/0x50 /kernel/exit.c:990 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc9e5af038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 0000000000459819 RDX: 0000000000413501 RSI: fffffffffffffff7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffff R09: 00007ffc9e5af090 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc9e5af090 R14: 0000000000000000 R15: 00007ffc9e5af0a0 INFO: task syz-executor.1:32158 blocked for more than 143 seconds. Not tainted 5.2.0+ #64 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28000 32158 359 0x80004000 Call Trace: context_switch /kernel/sched/core.c:3254 [inline] __schedule+0x772/0x1530 /kernel/sched/core.c:3880 schedule+0xa5/0x260 /kernel/sched/core.c:3944 rwsem_down_read_slowpath+0x4bb/0xf90 /kernel/locking/rwsem.c:1079 __down_read /kernel/locking/rwsem.c:1304 [inline] down_read+0x1f4/0x3f0 /kernel/locking/rwsem.c:1447 exit_mm /kernel/exit.c:513 [inline] do_exit+0x47b/0x2e10 /kernel/exit.c:864 do_group_exit+0x135/0x360 /kernel/exit.c:981 get_signal+0x47c/0x2490 /kernel/signal.c:2728 do_signal+0x87/0x16d0 /arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 /arch/x86/entry/common.c:159 prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline] syscall_return_slowpath /arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd4be871cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075bf28 RCX: 0000000000459819 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf28 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c R13: 00007ffc9e5aee2f R14: 00007fd4be8729c0 R15: 000000000075bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1056: #0: 00000000fe99835e (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x282 /kernel/locking/lockdep.c:5257 1 lock held by rsyslogd/9176: 2 locks held by getty/9297: #0: 0000000048abf458 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000005aa530a3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9298: #0: 0000000031097e74 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000cd652c50 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9299: #0: 000000000eeb6405 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000b4a4b4dc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9300: #0: 00000000d150483f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000052902068 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9301: #0: 00000000da4a00f0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000faa5e0f4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9302: #0: 00000000e43b3cab (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000005cd02e1e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9303: #0: 00000000545109c8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000005bdc9df3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/32157: #0: 00000000312883be (&mm->mmap_sem#2){++++}, at: exit_mm /kernel/exit.c:513 [inline] #0: 00000000312883be (&mm->mmap_sem#2){++++}, at: do_exit+0x47b/0x2e10 /kernel/exit.c:864 1 lock held by syz-executor.1/32158: #0: 00000000312883be (&mm->mmap_sem#2){++++}, at: exit_mm /kernel/exit.c:513 [inline] #0: 00000000312883be (&mm->mmap_sem#2){++++}, at: do_exit+0x47b/0x2e10 /kernel/exit.c:864 1 lock held by syz-executor.1/32166: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1056 Comm: khungtaskd Not tainted 5.2.0+ #64 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+0x16f/0x1f0 /lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 /lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x22d/0x25c /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+0x9dd/0xec0 /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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 23955 Comm: kworker/u4:6 Not tainted 5.2.0+ #64 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 /kernel/rcu/tree.c:300 [inline] RIP: 0010:rcu_is_watching+0x1d/0x80 /kernel/rcu/tree.c:894 Code: 51 fe ff ff 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 54 65 ff 05 0b 2c a3 7e 53 48 c7 c3 40 61 03 00 65 48 03 1d cb c1 a2 7e <4c> 8d a3 d8 00 00 00 be 04 00 00 00 4c 89 e7 e8 9f 1c 4c 00 4c 89 RSP: 0018:ffff88807b9b7cc0 EFLAGS: 00000282 RAX: ffff8880922ce180 RBX: ffff8880ae936140 RCX: ffffffff87166403 RDX: 0000000000000000 RSI: ffffffff87166694 RDI: 0000000000000001 RBP: ffff88807b9b7cd0 R08: ffff8880922ce180 R09: ffffed1015d26c44 R10: ffffed1015d26c43 R11: ffff8880ae93621b R12: 0000000000000001 R13: 000000000000030c R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000068eb3000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_unlock /./include/linux/rcupdate.h:642 [inline] batadv_nc_purge_orig_hash /net/batman-adv/network-coding.c:411 [inline] batadv_nc_worker+0x489/0x770 /net/batman-adv/network-coding.c:718 process_one_work+0x9af/0x16d0 /kernel/workqueue.c:2269 worker_thread+0x98/0xe40 /kernel/workqueue.c:2415 kthread+0x361/0x430 /kernel/kthread.c:255 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352