kworker/u4:11(6763): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(8227): getblk(): executed=9 bh_count=0 bh_state=0 kworker/u4:11(6763): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(8227): getblk(): executed=9 bh_count=0 bh_state=0 kworker/u4:11(6763): getblk(): executed=9 bh_count=0 bh_state=0 INFO: task syz-executor0:4408 blocked for more than 140 seconds. Not tainted 4.19.0-rc1-next-20180828+ #49 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D16904 4408 1 0x00000004 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 vfat_lookup+0xf1/0x640 fs/fat/namei_vfat.c:709 __lookup_slow+0x2b5/0x540 fs/namei.c:1671 lookup_slow+0x57/0x80 fs/namei.c:1688 walk_component+0x94a/0x2630 fs/namei.c:1810 link_path_walk.part.42+0xa6e/0x1540 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x268/0x5300 fs/namei.c:3533 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x584/0x720 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455190 Code: 24 98 00 00 00 48 89 14 24 e8 dc ef ff ff 48 8b 44 24 10 48 8b 4c 24 08 48 8b 54 24 70 48 39 d0 0f 85 69 01 00 00 48 8b 9c 24 <10> 01 00 00 48 89 1c 24 48 89 54 24 08 48 89 4c 24 10 48 89 44 24 RSP: 002b:00007fff38be8490 EFLAGS: 00000206 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455190 RDX: 0000000000000000 RSI: 0000000000090800 RDI: 00000000004c1d68 RBP: 0000000000000b72 R08: 0000000000000001 R09: 000000000185e940 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000002 R13: 00000000000978ce R14: 00000000000003a8 R15: badc0ffeebadface INFO: task syz-executor0:8234 blocked for more than 140 seconds. Not tainted 4.19.0-rc1-next-20180828+ #49 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D23984 8234 4408 0x00000004 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 d_wait_lookup fs/dcache.c:2428 [inline] d_alloc_parallel+0x1456/0x1eb0 fs/dcache.c:2510 __lookup_slow+0x1e6/0x540 fs/namei.c:1654 lookup_slow+0x57/0x80 fs/namei.c:1688 walk_component+0x94a/0x2630 fs/namei.c:1810 link_path_walk.part.42+0xa6e/0x1540 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x268/0x5300 fs/namei.c:3533 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x584/0x720 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x410dc1 Code: c7 84 24 80 00 00 00 00 00 00 00 48 c7 84 24 88 00 00 00 00 00 00 00 48 c7 84 24 90 00 00 00 00 00 00 00 48 8d 05 0f 5e 04 00 <48> 89 44 24 78 48 8d 44 24 50 48 89 84 24 80 00 00 00 48 8d 84 24 RSP: 002b:00007f5a12523bb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f5a125246d4 RCX: 0000000000410dc1 RDX: 00007f5a12523bdf RSI: 0000000000000002 RDI: 00007f5a12523bd0 RBP: 0000000000930140 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000004 R11: 0000000000000293 R12: 00000000ffffffff R13: 00000000004d6b70 R14: 00000000004ca09a R15: 0000000000000001 Showing all locks held in the system: 1 lock held by khungtaskd/774: #0: 00000000dd311036 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4436 2 locks held by rs:main Q:Reg/4267: #0: 00000000ec48e8f4 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1821 [inline] #0: 00000000ec48e8f4 (&rq->lock){-.-.}, at: __schedule+0x24d/0x1df0 kernel/sched/core.c:3411 #1: 0000000006fc5204 (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2780 [inline] #1: 0000000006fc5204 (sb_writers#6){.+.+}, at: vfs_write+0x42a/0x560 fs/read_write.c:548 1 lock held by rsyslogd/4269: #0: 00000000139e4d06 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/4359: #0: 0000000080c6b134 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000f20603b7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4360: #0: 00000000d68be1bb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000e29559fc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4361: #0: 0000000066f7e128 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000000b25ec2e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4362: #0: 00000000299b66ba (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000290b7c84 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4363: #0: 00000000db13f715 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000076d13755 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4364: #0: 0000000017e16309 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000008f987e5d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4365: #0: 00000000ed16259d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000012211564 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor0/4408: #0: 0000000033aadef1 (&sb->s_type->i_mutex_key#21){++++}, at: inode_lock_shared include/linux/fs.h:761 [inline] #0: 0000000033aadef1 (&sb->s_type->i_mutex_key#21){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1687 #1: 000000008c5acbbc (&sbi->s_lock){+.+.}, at: vfat_lookup+0xf1/0x640 fs/fat/namei_vfat.c:709 3 locks held by kworker/u4:11/6763: 3 locks held by syz-executor0/8227: 1 lock held by syz-executor0/8234: #0: 0000000033aadef1 (&sb->s_type->i_mutex_key#21){++++}, at: inode_lock_shared include/linux/fs.h:761 [inline] #0: 0000000033aadef1 (&sb->s_type->i_mutex_key#21){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1687 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 774 Comm: khungtaskd Not tainted 4.19.0-rc1-next-20180828+ #49 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:415 Sending NMI from CPU 1 to CPUs 0: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.017 msecs NMI backtrace for cpu 0 CPU: 0 PID: 4267 Comm: rs:main Q:Reg Not tainted 4.19.0-rc1-next-20180828+ #49 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ext4_ext_search_right+0x0/0xb10 include/linux/compiler.h:188 Code: e8 45 da b2 ff 48 8b 95 00 ff ff ff e9 64 fc ff ff e8 94 d9 b2 ff e9 31 fc ff ff 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 f3 48 83 ec 48 48 89 RSP: 0018:ffff8801b9256bd0 EFLAGS: 00000246 RAX: ffff8801b9256d88 RBX: ffff8801ca930e00 RCX: ffff8801b9256db0 RDX: ffff8801b9256d9c RSI: ffff8801ca930e00 RDI: ffff8801b6b1b5f0 RBP: ffff8801b9257010 R08: ffff8801b9256d08 R09: ffffed003b6046de R10: ffffed003b6046de R11: ffff8801db0236f3 R12: 0000000000028612 R13: ffff8801b6b1b424 R14: ffff8801b9256d08 R15: ffff8801b9256fe8 FS: 00007f4883f5a700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001b9152000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_map_blocks+0x8f3/0x1b60 fs/ext4/inode.c:636 mpage_map_one_extent fs/ext4/inode.c:2450 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2503 [inline] ext4_writepages+0x2475/0x3e90 fs/ext4/inode.c:2854 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2341 __filemap_fdatawrite_range+0x364/0x4a0 mm/filemap.c:445 file_write_and_wait_range+0x98/0x100 mm/filemap.c:753 ext4_sync_file+0x2d6/0x13b0 fs/ext4/fsync.c:128 vfs_fsync_range+0x140/0x220 fs/sync.c:197 generic_write_sync include/linux/fs.h:2751 [inline] ext4_file_write_iter+0x6a3/0x1450 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1820 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x6af/0x9d0 fs/read_write.c:487 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f48859b819d Code: d1 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 be fa ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 07 fb ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f4883f58f90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000400 RCX: 00007f48859b819d RDX: 0000000000000400 RSI: 000000000194aa90 RDI: 0000000000000005 RBP: 000000000194aa90 R08: 3020383220677541 R09: 2039353a30313a38 R10: 656c6c616b7a7973 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f4883f59410 R14: 000000000196bc00 R15: 000000000194a890