INFO: task syz-executor.5:27389 blocked for more than 143 seconds. Not tainted 5.2.0-rc6+ #7 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D25760 27389 21371 0x80004000 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x658/0x9e0 kernel/sched/core.c:3445 schedule+0x131/0x1d0 kernel/sched/core.c:3509 __rwsem_down_read_failed_common+0x345/0x790 kernel/locking/rwsem-xadd.c:495 rwsem_down_read_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:515 __down_read+0x72/0x1a0 kernel/locking/rwsem.h:178 down_read+0x45/0x50 kernel/locking/rwsem.c:26 exit_mm+0xdb/0x630 kernel/exit.c:513 do_exit+0x5c3/0x2300 kernel/exit.c:864 do_group_exit+0x15c/0x2a0 kernel/exit.c:981 __do_sys_exit_group+0x17/0x20 kernel/exit.c:992 __se_sys_exit_group+0x14/0x20 kernel/exit.c:990 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:990 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: Bad RIP value. RSP: 002b:00007fffaeff6a18 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 0000000000459519 RDX: 0000000000413201 RSI: fffffffffffffff7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffff R09: 00007fffaeff6a70 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000001 R13: 00007fffaeff6a70 R14: 0000000000000000 R15: 00007fffaeff6a80 INFO: task syz-executor.5:27395 blocked for more than 143 seconds. Not tainted 5.2.0-rc6+ #7 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D25056 27395 21371 0x80004000 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x658/0x9e0 kernel/sched/core.c:3445 schedule+0x131/0x1d0 kernel/sched/core.c:3509 __rwsem_down_read_failed_common+0x345/0x790 kernel/locking/rwsem-xadd.c:495 rwsem_down_read_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:515 __down_read+0x72/0x1a0 kernel/locking/rwsem.h:178 down_read+0x45/0x50 kernel/locking/rwsem.c:26 exit_mm+0xdb/0x630 kernel/exit.c:513 do_exit+0x5c3/0x2300 kernel/exit.c:864 do_group_exit+0x15c/0x2a0 kernel/exit.c:981 get_signal+0x6df/0x21f0 kernel/signal.c:2640 do_signal+0x7b/0x750 arch/x86/kernel/signal.c:815 exit_to_usermode_loop arch/x86/entry/common.c:164 [inline] prepare_exit_to_usermode+0x2f5/0x4f0 arch/x86/entry/common.c:199 syscall_return_slowpath+0x110/0x440 arch/x86/entry/common.c:279 do_syscall_64+0x126/0x140 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: Bad RIP value. RSP: 002b:00007fea785f1cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000075bfd0 RCX: 0000000000459519 RDX: 00000000004c73ef RSI: 0000000000000081 RDI: 000000000075bfd4 RBP: 000000000075bfc8 R08: 0000000000000016 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000075bfd4 R13: 00007fffaeff680f R14: 00007fea785f29c0 R15: 000000000075bfd4 INFO: task syz-executor.5:27407 blocked for more than 144 seconds. Not tainted 5.2.0-rc6+ #7 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D24096 27407 21371 0x80004000 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x658/0x9e0 kernel/sched/core.c:3445 schedule+0x131/0x1d0 kernel/sched/core.c:3509 __rwsem_down_read_failed_common+0x345/0x790 kernel/locking/rwsem-xadd.c:495 rwsem_down_read_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:515 __down_read+0x72/0x1a0 kernel/locking/rwsem.h:178 down_read+0x45/0x50 kernel/locking/rwsem.c:26 exit_mm+0xdb/0x630 kernel/exit.c:513 do_exit+0x5c3/0x2300 kernel/exit.c:864 do_group_exit+0x15c/0x2a0 kernel/exit.c:981 get_signal+0x6df/0x21f0 kernel/signal.c:2640 do_signal+0x7b/0x750 arch/x86/kernel/signal.c:815 exit_to_usermode_loop arch/x86/entry/common.c:164 [inline] prepare_exit_to_usermode+0x2f5/0x4f0 arch/x86/entry/common.c:199 syscall_return_slowpath+0x110/0x440 arch/x86/entry/common.c:279 do_syscall_64+0x126/0x140 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: Bad RIP value. RSP: 002b:00007fea785d0cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075c078 RCX: 0000000000459519 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075c078 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075c07c R13: 00007fffaeff680f R14: 00007fea785d19c0 R15: 000000000075c07c Showing all locks held in the system: 1 lock held by khungtaskd/1042: #0: 00000000b72120a0 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 1 lock held by rsyslogd/7668: #0: 000000000d7f4242 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x243/0x2e0 fs/file.c:801 2 locks held by getty/7759: #0: 000000000712327a (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: 0000000010b15307 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ee/0x1c80 drivers/tty/n_tty.c:2156 2 locks held by getty/7760: #0: 00000000e5b58c63 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: 000000000323dd51 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ee/0x1c80 drivers/tty/n_tty.c:2156 2 locks held by getty/7761: #0: 0000000016e9da9e (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: 00000000abaaf815 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ee/0x1c80 drivers/tty/n_tty.c:2156 2 locks held by getty/7762: #0: 00000000b4cea1ef (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: 0000000098f338c7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ee/0x1c80 drivers/tty/n_tty.c:2156 2 locks held by getty/7763: #0: 00000000a19b631d (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: 00000000785782f6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ee/0x1c80 drivers/tty/n_tty.c:2156 2 locks held by getty/7764: #0: 00000000069e1fd1 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: 00000000216f74d5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ee/0x1c80 drivers/tty/n_tty.c:2156 2 locks held by getty/7765: #0: 00000000aa735057 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: 000000004ad1189e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ee/0x1c80 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.5/27389: #0: 000000009a0a926a (&mm->mmap_sem#2){++++}, at: exit_mm+0xdb/0x630 kernel/exit.c:513 1 lock held by syz-executor.5/27390: 1 lock held by syz-executor.5/27395: #0: 000000009a0a926a (&mm->mmap_sem#2){++++}, at: exit_mm+0xdb/0x630 kernel/exit.c:513 1 lock held by syz-executor.5/27407: #0: 000000009a0a926a (&mm->mmap_sem#2){++++}, at: exit_mm+0xdb/0x630 kernel/exit.c:513 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.2.0-rc6+ #7 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+0x1d8/0x2f8 lib/dump_stack.c:113 nmi_cpu_backtrace+0x89/0x160 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x125/0x230 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xbb9/0xbd0 kernel/hung_task.c:289 kthread+0x325/0x350 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: 2991 Comm: kworker/u4:4 Not tainted 5.2.0-rc6+ #7 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:__lock_acquire+0x25c/0x1a40 kernel/locking/lockdep.c:3730 Code: 85 d2 75 0b 3d ff 0f 00 00 0f 84 47 0e 00 00 41 81 c6 00 00 10 00 e9 77 02 00 00 31 c0 4c 8b 75 18 4c 8d 0c 80 4c 8b 7c 24 10 <4b> 8d 9c cf 88 08 00 00 48 89 d8 48 c1 e8 03 48 89 84 24 88 00 00 RSP: 0018:ffff88809e10f980 EFLAGS: 00000046 RAX: 0000000000000002 RBX: 0000000000000002 RCX: 1ffff11013c21f44 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffffffff88ad4080 RBP: ffff88809e10fb60 R08: 0000000000000000 R09: 000000000000000a R10: ffffffff8779e0a9 R11: 1ffff11015d46bf7 R12: 0000000000000002 R13: ffff88809e102a08 R14: ffffffff8779e0a9 R15: ffff88809e102140 FS: 0000000000000000(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000004b3e1000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x158/0x250 kernel/locking/lockdep.c:4303 rcu_lock_acquire+0x2e/0x40 include/linux/rcupdate.h:208 rcu_read_lock include/linux/rcupdate.h:593 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:407 [inline] batadv_nc_worker+0xdc/0x600 net/batman-adv/network-coding.c:718 process_one_work+0x814/0x1130 kernel/workqueue.c:2269 worker_thread+0xc01/0x1640 kernel/workqueue.c:2415 kthread+0x325/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352