INFO: task syz-executor.2:15188 blocked for more than 143 seconds. Not tainted 5.6.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28152 15188 9785 0x00004004 Call Trace: context_switch kernel/sched/core.c:3380 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4080 schedule+0xdc/0x2b0 kernel/sched/core.c:4154 schedule_timeout+0x717/0xc50 kernel/time/timer.c:1871 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_timeout+0x2b9/0x480 kernel/sched/completion.c:155 usb_start_wait_urb+0x173/0x2f0 drivers/usb/core/message.c:62 usb_bulk_msg+0x229/0x550 drivers/usb/core/message.c:253 proc_bulk+0x462/0x820 drivers/usb/core/devio.c:1226 usbdev_do_ioctl drivers/usb/core/devio.c:2530 [inline] usbdev_ioctl+0x530/0x3180 drivers/usb/core/devio.c:2696 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x123/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:770 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c479 Code: Bad RIP value. RSP: 002b:00007f8e86262c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8e862636d4 RCX: 000000000045c479 RDX: 00000000200000c0 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000005cd R14: 00000000004c832b R15: 000000000076bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1126: #0: ffffffff89bac340 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5333 2 locks held by kworker/1:7/3848: 1 lock held by rsyslogd/9645: #0: ffff8880a90093a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:821 2 locks held by getty/9735: #0: ffff88808e89e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000583b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9736: #0: ffff88809893a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000587b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9737: #0: ffff88809b732090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000585b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9738: #0: ffff8880a3a0b090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000589b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9739: #0: ffff88809886c090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900058ab2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9740: #0: ffff8880a862e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000588b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9741: #0: ffff88809f07e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900057eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1126 Comm: khungtaskd Not tainted 5.6.0-rc3-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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+0xb11/0x10c0 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: 9764 Comm: syz-fuzzer Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:pagevec_lru_move_fn+0x16d/0x2a0 mm/swap.c:200 Code: 44 89 e6 e8 05 29 dd ff 41 39 dc 76 6d 4c 89 75 d0 e8 f7 27 dd ff 4c 63 e3 4b 8d 7c e5 08 48 89 f8 48 c1 e8 03 42 80 3c 38 00 <0f> 85 e6 00 00 00 4f 8b 64 e5 08 4c 89 e0 48 c1 e8 03 42 80 3c 38 RSP: 0018:ffffc900064bfaf0 EFLAGS: 00000246 RAX: 1ffff11015d2670d RBX: 0000000000000000 RCX: ffffffff81986e59 RDX: 0000000000000000 RSI: ffffffff81986f59 RDI: ffff8880ae933868 RBP: ffffc900064bfb48 R08: ffff8880a811a340 R09: ffffed1014c802f8 R10: ffffed1014c802f7 R11: ffff8880a64017bf R12: 0000000000000000 R13: ffff8880ae933860 R14: ffffffff897cb1a8 R15: dffffc0000000000 FS: 000000c00007ce90(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000902a6000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lru_add_drain_cpu+0x3e7/0x5c0 mm/swap.c:621 lru_add_drain+0x2c/0x70 mm/swap.c:694 madvise_free_single_vma+0x1d2/0x610 mm/madvise.c:713 madvise_dontneed_free mm/madvise.c:805 [inline] madvise_vma mm/madvise.c:942 [inline] do_madvise mm/madvise.c:1121 [inline] do_madvise+0x576/0x1d60 mm/madvise.c:1047 __do_sys_madvise mm/madvise.c:1147 [inline] __se_sys_madvise mm/madvise.c:1145 [inline] __x64_sys_madvise+0x73/0xb0 mm/madvise.c:1145 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x460bf7 Code: 8b 24 24 48 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 48 c7 c0 1c 00 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 RSP: 002b:000000c000125e70 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000000460bf7 RDX: 0000000000000008 RSI: 0000000000002000 RDI: 000000c02f2c8000 RBP: 000000c000125eb0 R08: 000000c02f200000 R09: 000000c02f2ca000 R10: 00007fffffffffff R11: 0000000000000246 R12: 00000187d249f78d R13: 0000000000000001 R14: 00000187d249f78d R15: 000000000000d61d