INFO: task syz-executor7:2687 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #220 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor7 D24064 2687 4671 0x00000000 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3575 __mutex_lock_common kernel/locking/mutex.c:1003 [inline] __mutex_lock+0xbf9/0x1700 kernel/locking/mutex.c:1073 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088 mon_bin_fetch+0x37/0x340 drivers/usb/mon/mon_bin.c:909 mon_bin_ioctl+0x2ab/0xe80 drivers/usb/mon/mon_bin.c:1091 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 audit: type=1326 audit(1536028223.489:208): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=25668 comm="syz-executor7" exe="/root/syz-executor7" sig=9 arch=c000003e syscall=202 compat=0 ip=0x457099 code=0x0 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457099 Code: Bad RIP value. RSP: 002b:00007ff17af19c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff17af1a6d4 RCX: 0000000000457099 RDX: 0000000020000000 RSI: 00000000c0109207 RDI: 0000000000000004 RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cf640 R14: 00000000004c593b R15: 0000000000000002 Showing all locks held in the system: 1 lock held by khungtaskd/791: #0: 00000000d1ef6de3 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4436 1 lock held by rsyslogd/4529: 2 locks held by getty/4619: #0: 00000000396931ff (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000008d53519 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4620: #0: 000000006ea9f27f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000558c0542 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4621: #0: 00000000512c6393 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000005390b2b1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4622: #0: 00000000ffdec0b9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000f32448cc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4623: #0: 00000000900e86a6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000072356feb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4624: #0: 000000007ece330f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000b985a3d7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4625: #0: 00000000c41bf000 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000c832b76f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 1 lock held by syz-executor7/2614: #0: 0000000036f7c216 (&rp->fetch_lock){+.+.}, at: mon_bin_read+0x60/0x650 drivers/usb/mon/mon_bin.c:813 1 lock held by syz-executor7/2687: #0: 0000000036f7c216 (&rp->fetch_lock){+.+.}, at: mon_bin_fetch+0x37/0x340 drivers/usb/mon/mon_bin.c:909 1 lock held by syz-executor4/4574: #0: 000000000f5aae49 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds+0x53/0x120 fs/exec.c:1404 1 lock held by syz-executor4/4592: #0: 0000000041ca01b9 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds+0x53/0x120 fs/exec.c:1404 2 locks held by syz-executor7/25678: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 791 Comm: khungtaskd Not tainted 4.19.0-rc2+ #220 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+0x1c9/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x151/0x192 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:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb39/0x1040 kernel/hung_task.c:265 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 Sending NMI from CPU 0 to CPUs 1: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.317 msecs NMI backtrace for cpu 1 CPU: 1 PID: 25699 Comm: syz-executor6 Not tainted 4.19.0-rc2+ #220 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__preempt_count_sub arch/x86/include/asm/preempt.h:81 [inline] RIP: 0010:rcu_read_unlock_sched_notrace include/linux/rcupdate.h:773 [inline] RIP: 0010:trace_block_touch_buffer include/trace/events/block.h:45 [inline] RIP: 0010:touch_buffer fs/buffer.c:58 [inline] RIP: 0010:__find_get_block+0x7d5/0xdf0 fs/buffer.c:1298 Code: 1d e8 3f 12 a6 ff 0f b6 1d 2a 31 d4 06 31 ff 89 de e8 ff 12 a6 ff 84 db 0f 84 5e 03 00 00 e8 22 12 a6 ff 65 ff 0d cb 30 2b 7e 61 fb ff ff 4c 8b a5 78 fe ff ff 4c 8b bd 70 fe ff ff e8 03 12 RSP: 0000:ffff88008623ecb8 EFLAGS: 00000287 RAX: ffff880096afa100 RBX: 0000000000000001 RCX: ffffffff81d6c06c RDX: 0000000000000000 RSI: ffffffff81d6bcfe RDI: 0000000000000005 RBP: ffff88008623ee48 R08: ffff880096afa100 R09: ffffed003b6246de R10: ffffed003b6246de R11: ffff8801db1236f3 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8801d56d00a8 FS: 00000000023d6940(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ca20000 CR3: 00000001050cb000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __getblk_gfp+0xde/0xb10 fs/buffer.c:1316 sb_getblk include/linux/buffer_head.h:325 [inline] __ext4_get_inode_loc+0x408/0x1350 fs/ext4/inode.c:4564 ext4_get_inode_loc fs/ext4/inode.c:4677 [inline] ext4_reserve_inode_write+0xf8/0x260 fs/ext4/inode.c:5834 ext4_mark_inode_dirty+0x182/0xab0 fs/ext4/inode.c:5986 ext4_dirty_inode+0x97/0xc0 fs/ext4/inode.c:6025 __mark_inode_dirty+0x760/0x1300 fs/fs-writeback.c:2129 generic_update_time+0x26a/0x450 fs/inode.c:1651 update_time fs/inode.c:1667 [inline] file_update_time+0x390/0x640 fs/inode.c:1877 ext4_page_mkwrite+0x1fe/0x1430 fs/ext4/inode.c:6169 do_page_mkwrite+0x14e/0x520 mm/memory.c:2388 do_shared_fault mm/memory.c:3717 [inline] do_fault mm/memory.c:3756 [inline] handle_pte_fault mm/memory.c:3983 [inline] __handle_mm_fault+0x2a0a/0x4350 mm/memory.c:4107 handle_mm_fault+0x53e/0xc80 mm/memory.c:4144 __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1395 do_page_fault+0xf6/0x7a4 arch/x86/mm/fault.c:1470 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1161 RIP: 0033:0x405947 Code: 00 00 00 48 83 ec 08 48 8b 15 15 a7 52 00 48 8b 05 06 a7 52 00 48 39 d0 48 8d 8a 00 00 00 01 72 17 48 39 c8 73 12 48 8d 50 04 <89> 38 48 89 15 e8 a6 52 00 48 83 c4 08 c3 48 89 c6 bf 58 bf 4b 00 RSP: 002b:0000000000a3fc10 EFLAGS: 00010287 RAX: 0000001b2ca20000 RBX: 0000000000000003 RCX: 0000001b2da20000 RDX: 0000001b2ca20004 RSI: 0000000000a3f9d0 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000013 R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000005 R13: 00000000000d23f0 R14: 00000000000000b7 R15: badc0ffeebadface