INFO: task syz-executor269:7817 blocked for more than 140 seconds. Not tainted 4.19.52 #24 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor269 D28216 7817 7639 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80d/0x1c70 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:1181 RIP: 0033:0x4ab79d Code: Bad RIP value. RSP: 002b:00007ffeec1b1820 EFLAGS: 00010206 RAX: 00000000004ab8c0 RBX: 0000000000000001 RCX: 00000000006e0330 RDX: 0000000000407620 RSI: 0000000000000000 RDI: 00000000004ccb90 RBP: 00007ffeec1b1840 R08: 000000037ffffa00 R09: 000000037ffffa00 R10: 00007ffeec1b18b0 R11: 0000000000000000 R12: 0000000000000001 R13: 00000000006e0320 R14: 000000000000002d R15: 20c49ba5e353f7cf INFO: task syz-executor269:7818 blocked for more than 140 seconds. Not tainted 4.19.52 #24 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor269 D28312 7818 7639 0x80000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80d/0x1c70 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 exit_mm kernel/exit.c:512 [inline] do_exit+0x45b/0x2fa0 kernel/exit.c:863 do_group_exit+0x135/0x370 kernel/exit.c:979 get_signal+0x3ec/0x1fc0 kernel/signal.c:2574 do_signal+0x95/0x1960 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4468f9 Code: 67 66 69 6c 65 3d 64 65 62 75 67 2e 63 22 0a 00 00 45 52 52 4f 52 3a 20 6f 75 74 20 6f 66 20 6d 65 6d 6f 72 79 20 64 75 72 69 <6e> 67 20 64 65 62 75 67 20 73 65 74 75 70 0a 00 00 00 00 00 00 00 RSP: 002b:00007f79688eedb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000006dbc28 RCX: 00000000004468f9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc28 RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c R13: 00007ffeec1b181f R14: 00007f79688ef9c0 R15: 20c49ba5e353f7cf Showing all locks held in the system: 1 lock held by khungtaskd/1031: #0: 00000000ab6fdb3e (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4435 3 locks held by rs:main Q:Reg/7486: 1 lock held by rsyslogd/7489: #0: 000000008ebd9283 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/7610: #0: 000000001941e025 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 0000000094b2e512 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7611: #0: 00000000991fb8af (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000002ef3e92f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7612: #0: 00000000800958b3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000007bda60ba (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7613: #0: 00000000920f144a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000c4b7763e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7614: #0: 0000000029e697b4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000007d9cdfb2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7615: #0: 0000000017c4ddbe (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000fa58b44e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7616: #0: 00000000ab1cfc7c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000001f0557e7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 1 lock held by syz-executor269/7817: #0: 0000000077e3f004 (&mm->mmap_sem){++++}, at: __do_page_fault+0xb1a/0xe90 arch/x86/mm/fault.c:1329 1 lock held by syz-executor269/7818: #0: 0000000077e3f004 (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 0000000077e3f004 (&mm->mmap_sem){++++}, at: do_exit+0x45b/0x2fa0 kernel/exit.c:863 1 lock held by syz-executor269/7819: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1031 Comm: khungtaskd Not tainted 4.19.52 #24 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7819 Comm: syz-executor269 Not tainted 4.19.52 #24 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x18/0x50 kernel/kcov.c:101 Code: e9 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 c8 e6 96 7e <81> e2 00 01 1f 00 75 2b 8b 90 d0 12 00 00 83 fa 02 75 20 48 8b 88 RSP: 0018:ffff88808ff6faa0 EFLAGS: 00000293 RAX: ffff8880817b4380 RBX: ffff8880a6472668 RCX: ffffffff818145fa RDX: 0000000080000000 RSI: ffffffff8181451e RDI: 0000000000000005 RBP: ffff88808ff6faa0 R08: ffff8880817b4380 R09: ffffed1014c8e4ce R10: ffffed1014c8e4cd R11: ffff8880a647266b R12: ffff8880a64725c0 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888097c7a8f0 FS: 00007f79688ce700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000009f180000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: perf_mmap+0x71e/0x1730 kernel/events/core.c:5668 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:00007f79688cdda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 00000000004468f9 RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000020fff000 RBP: 00000000006dbc30 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000001011 R11: 0000000000000246 R12: 00000000006dbc3c R13: 00007ffeec1b181f R14: 00007f79688ce9c0 R15: 20c49ba5e353f7cf