INFO: task syz-executor286:7917 blocked for more than 140 seconds. Not tainted 4.19.65 #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor286 D28216 7917 7878 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3474 schedule+0x92/0x1c0 kernel/sched/core.c:3518 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21b/0x3c0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 __do_page_fault+0xb1a/0xe90 arch/x86/mm/fault.c:1329 do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1468 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1204 RIP: 0033:0x4ab79d Code: Bad RIP value. RSP: 002b:00007ffc7ef9d780 EFLAGS: 00010206 RAX: 00000000004ab8c0 RBX: 0000000000000001 RCX: 00000000006e0330 RDX: 0000000000407620 RSI: 0000000000000000 RDI: 00000000004ccb90 RBP: 00007ffc7ef9d7a0 R08: 000000037ffffa00 R09: 000000037ffffa00 R10: 00007ffc7ef9d810 R11: 0000000000000000 R12: 0000000000000001 R13: 00000000006e0320 R14: 000000000000002d R15: 20c49ba5e353f7cf Showing all locks held in the system: 1 lock held by khungtaskd/1039: #0: 000000000dac360a (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4435 3 locks held by rs:main Q:Reg/7727: #0: 0000000084d87c8e (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1821 [inline] #0: 0000000084d87c8e (&rq->lock){-.-.}, at: __schedule+0x1f8/0x1dc0 kernel/sched/core.c:3412 #1: 00000000ead433fe (sb_writers#4){.+.+}, at: file_start_write include/linux/fs.h:2775 [inline] #1: 00000000ead433fe (sb_writers#4){.+.+}, at: vfs_write+0x429/0x560 fs/read_write.c:548 #2: 000000000dac360a (rcu_read_lock){....}, at: inode_trylock include/linux/fs.h:767 [inline] #2: 000000000dac360a (rcu_read_lock){....}, at: ext4_file_write_iter+0x23f/0x1060 fs/ext4/file.c:236 1 lock held by rsyslogd/7729: #0: 00000000e8442a07 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/7851: #0: 00000000f66b629b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000008cc322b2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7852: #0: 00000000a0cd65d7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 0000000033d8c79d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7853: #0: 000000001ac65ff1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 0000000038bd9a71 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7854: #0: 0000000081ec128a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000f802f05a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7855: #0: 0000000024dc0269 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000008659a96b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7856: #0: 0000000037dd64f8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000009c5f3646 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7857: #0: 00000000e7a6f662 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 0000000070987bf2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 1 lock held by syz-executor286/7917: #0: 00000000bba82b8e (&mm->mmap_sem){++++}, at: __do_page_fault+0xb1a/0xe90 arch/x86/mm/fault.c:1329 1 lock held by syz-executor286/7918: #0: 00000000bba82b8e (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000bba82b8e (&mm->mmap_sem){++++}, at: do_exit+0x4bc/0x2fa0 kernel/exit.c:863 2 locks held by syz-executor286/7919: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1039 Comm: khungtaskd Not tainted 4.19.65 #39 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 CPU: 1 PID: 7919 Comm: syz-executor286 Not tainted 4.19.65 #39 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:hlock_class kernel/locking/lockdep.c:145 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2331 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:2386 [inline] RIP: 0010:__lock_acquire+0xce9/0x49c0 kernel/locking/lockdep.c:3411 Code: 60 44 8b 5c 24 68 44 8b 4c 24 70 e9 db f8 ff ff 48 8b 94 24 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 <84> c0 74 21 3c 01 7f 1d 48 8b bc 24 80 00 00 00 4c 89 94 24 98 00 RSP: 0018:ffff8880991ef6b0 EFLAGS: 00000806 RAX: 0000000000000000 RBX: 00000000bbbd4c73 RCX: 00000000c96d14d9 RDX: 1ffff11010ce75b1 RSI: ffff88808673ad40 RDI: 0000000000000000 RBP: ffff8880991ef880 R08: 0000000000000001 R09: 0000000000000001 R10: ffff88808673ad68 R11: 000000006550c77d R12: 785f29aa7c5c2124 R13: 72b9d3e2a638753c R14: ffff88808673a4c0 R15: 0000000000000000 FS: 00007febcc703700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000008c728000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 perf_mmap+0x730/0x19b0 kernel/events/core.c:5678 call_mmap include/linux/fs.h:1825 [inline] mmap_region+0xc2f/0x1760 mm/mmap.c:1763 do_mmap+0x8e2/0x1080 mm/mmap.c:1536 do_mmap_pgoff include/linux/mm.h:2319 [inline] vm_mmap_pgoff+0x1c5/0x230 mm/util.c:357 ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1586 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4468f9 Code: e8 5c b3 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 0b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007febcc702da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 00000000004468f9 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000 RBP: 00000000006dbc30 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000001011 R11: 0000000000000246 R12: 00000000006dbc3c R13: 00007ffc7ef9d77f R14: 00007febcc7039c0 R15: 20c49ba5e353f7cf