syz-executor3(30485): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor3(30485): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor3(30485): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor3(30485): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor3(30485): getblk(): executed=9 bh_count=0 bh_state=0 INFO: task syz-executor3:18860 blocked for more than 140 seconds. Not tainted 4.19.0-rc7-next-20181011+ #92 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D18376 18860 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3480 schedule+0xfe/0x460 kernel/sched/core.c:3524 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3582 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xaff/0x16f0 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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+0x92b/0x2590 fs/namei.c:1810 syz-executor3(30485): getblk(): executed=9 bh_count=0 bh_state=0 link_path_walk.part.40+0xa61/0x1530 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x270/0x5150 fs/namei.c:3533 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 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: 0033:0x455540 Code: Bad RIP value. RSP: 002b:00007fff3e75bcf0 EFLAGS: 00000206 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455540 RDX: 0000000000000000 RSI: 0000000000090800 RDI: 00000000004bc26e RBP: 0000000000004c8f R08: 0000000000000001 R09: 0000000000cf2940 R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000000c R13: 00000000001e3fc2 R14: 0000000000001c07 R15: 0000000000000003 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 981 Comm: khungtaskd Not tainted 4.19.0-rc7-next-20181011+ #92 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+0x244/0x3ab lib/dump_stack.c:113 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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+0xb39/0x1050 kernel/hung_task.c:265 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.371 msecs NMI backtrace for cpu 0 CPU: 0 PID: 30485 Comm: syz-executor3 Not tainted 4.19.0-rc7-next-20181011+ #92 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_lock_acquire include/linux/rcupdate.h:223 [inline] RIP: 0010:rcu_read_lock include/linux/rcupdate.h:607 [inline] RIP: 0010:find_get_entry+0x319/0x1120 mm/filemap.c:1412 Code: e8 dc b0 ca ff e8 e7 e7 e0 ff 45 31 c9 45 31 c0 31 d2 31 f6 b9 02 00 00 00 68 53 82 9d 81 48 c7 c7 00 a6 39 89 e8 77 28 c3 ff 32 02 ca ff 31 ff 89 c3 89 c6 e8 c7 e8 e0 ff 85 db 5e 74 1d e8 RSP: 0018:ffff8801c172e558 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8801c4e16760 RCX: 0000000000000000 RDX: 1ffffffff1263ebe RSI: 0000000000000000 RDI: 0000000000000282 RBP: ffff8801c172e918 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffea0006ac68f7 R12: ffff8801c172e8f0 R13: dffffc0000000000 R14: 0000000000000041 R15: 0000000000000000 FS: 00007f4fe7e37700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001c51c7000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pagecache_get_page+0x12f/0xf00 mm/filemap.c:1518 find_get_page_flags include/linux/pagemap.h:278 [inline] __find_get_block_slow fs/buffer.c:205 [inline] __find_get_block+0x635/0xf10 fs/buffer.c:1325 __getblk_slow fs/buffer.c:1058 [inline] __getblk_gfp+0x3d3/0x1030 fs/buffer.c:1351 __bread_gfp+0x2d/0x310 fs/buffer.c:1385 sb_bread include/linux/buffer_head.h:307 [inline] fat__get_entry+0x5a6/0xa40 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_search_long+0x33b/0x1570 fs/fat/dir.c:479 vfat_find+0x16d/0x1a0 fs/fat/namei_vfat.c:697 vfat_lookup+0x107/0x640 fs/fat/namei_vfat.c:711 lookup_open+0x72e/0x1b90 fs/namei.c:3213 do_last fs/namei.c:3324 [inline] path_openat+0x2464/0x5150 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457519 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4fe7e36c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457519 RDX: 0000000000000002 RSI: 0000000020000280 RDI: ffffffffffffff9c RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4fe7e376d4 R13: 00000000004c2b8a R14: 00000000004d4230 R15: 00000000ffffffff