b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 INFO: task kworker/0:1:24 blocked for more than 120 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 4.9.107-gdb2c520 #46 b_state=0x00000029, b_size=512 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. device loop0 blocksize: 4096 kworker/0:1 D __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 26984 24 2 0x00000000 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 Workqueue: events linkwatch_event __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ffff8801d9bcc800 device loop0 blocksize: 4096 ffff8801d8104fc0 ffff8801d446c540 ffff8801cc8e6000__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ffff8801db221c18 device loop0 blocksize: 4096 ffff8801d940fae8 ffffffff839e8c1d ffff8801d9bcd0c8__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ffffed003b379a18 device loop0 blocksize: 4096 ffff8801d9bcc800 00fffc0000000000 ffff8801db2224e8__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 Call Trace: device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] schedule+0x7f/0x1b0 kernel/sched/core.c:3557 b_state=0x00000029, b_size=512 [] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3590 device loop0 blocksize: 4096 [] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 b_state=0x00000029, b_size=512 [] linkwatch_event+0xe/0x60 net/core/link_watch.c:236 device loop0 blocksize: 4096 [] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 [] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 [] kthread+0x26d/0x300 kernel/kthread.c:211 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 b_state=0x00000029, b_size=512 Showing all locks held in the system: device loop0 blocksize: 4096 3 locks held by kworker/u4:0/6: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 "%s""netns"){.+.+.+}, at: [] work_static include/linux/workqueue.h:186 [inline] "%s""netns"){.+.+.+}, at: [] set_work_data kernel/workqueue.c:617 [inline] "%s""netns"){.+.+.+}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] "%s""netns"){.+.+.+}, at: [] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 net_cleanup_work){+.+.+.}, at: [] process_one_work+0x728/0x1500 kernel/workqueue.c:2089 #2: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 (net_mutex__find_get_block_slow() failed. block=1, b_blocknr=8 ){+.+.+.}b_state=0x00000029, b_size=512 , at: [] cleanup_net+0x13f/0x630 net/core/net_namespace.c:439 3 locks held by kworker/0:1/24: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, b_size=512 "events"device loop0 blocksize: 4096 ){.+.+.+}, at: [] work_static include/linux/workqueue.h:186 [inline] ){.+.+.+}, at: [] set_work_data kernel/workqueue.c:617 [inline] ){.+.+.+}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] ){.+.+.+}, at: [] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 (linkwatch_work).work){+.+.+.}, at: [] process_one_work+0x728/0x1500 kernel/workqueue.c:2089 #2: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 3 locks held by kworker/1:1/25: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 ("%s"("ipv6_addrconf")){.+.+..}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] work_static include/linux/workqueue.h:186 [inline] , at: [] set_work_data kernel/workqueue.c:617 [inline] , at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] , at: [] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085 #1: device loop0 blocksize: 4096 ((addr_chk_work).work){+.+...}, at: [] process_one_work+0x728/0x1500 kernel/workqueue.c:2089 #2: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 2 locks held by khungtaskd/519: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (rcu_read_lock){......}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] (rcu_read_lock){......}, at: [] watchdog+0x11c/0xa20 kernel/hung_task.c:239 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 tasklist_lock){.+.?..}, at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 1 lock held by rsyslogd/3683: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (&f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/3779: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 &ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 2 locks held by syz-executor1/22962: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 __ip_vs_mutex){+.+.+.}, at: [] ip_vs_dst_event+0xc9/0x650 net/netfilter/ipvs/ip_vs_ctl.c:1574 b_state=0x00000029, b_size=512 1 lock held by syz-executor7/25341: device loop0 blocksize: 4096 #0: (rtnl_mutex){+.+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 1 lock held by syz-executor7/25344: device loop0 blocksize: 4096 #0: (rtnl_mutex){+.+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 1 lock held by syz-executor7/25349: device loop0 blocksize: 4096 #0: (__ip_vs_mutex){+.+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] do_ip_vs_get_ctl+0x262/0xed0 net/netfilter/ipvs/ip_vs_ctl.c:2721 1 lock held by syz-executor7/25351: device loop0 blocksize: 4096 #0: (__ip_vs_mutex){+.+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] do_ip_vs_set_ctl+0x218/0xbb0 net/netfilter/ipvs/ip_vs_ctl.c:2405 1 lock held by syz-executor4/25338: device loop0 blocksize: 4096 #0: (rtnl_mutex){+.+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 2 locks held by syz-executor4/25363: device loop0 blocksize: 4096 #0: (net_mutex){+.+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406 #1: device loop0 blocksize: 4096 (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 1 lock held by syz-executor4/25368: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 1 lock held by syz-executor4/25376: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (net_mutex){+.+.+.}, at: [] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406 1 lock held by init/25378: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/25379: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/25380: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/25381: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/25382: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/25383: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by syz-executor1/25385: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (net_mutex){+.+.+.}, at: [] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406 b_state=0x00000029, b_size=512 ============================================= device loop0 blocksize: 4096 NMI backtrace for cpu 0 CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.107-gdb2c520 #46 __find_get_block_slow() failed. block=1, b_blocknr=8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 b_state=0x00000029, b_size=512 ffff8801d8607d08 device loop0 blocksize: 4096 ffffffff81eb3da9 0000000000000000 0000000000000000__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 0000000000000000 device loop0 blocksize: 4096 0000000000000001 ffffffff810b96a0 ffff8801d8607d40__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ffffffff81ebf0a7 device loop0 blocksize: 4096 0000000000000000 0000000000000000 0000000000000003__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 Call Trace: device loop0 blocksize: 4096 [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 [] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60 b_state=0x00000029, b_size=512 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 device loop0 blocksize: 4096 [] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6b4/0xa20 kernel/hung_task.c:239 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 [] kthread+0x26d/0x300 kernel/kthread.c:211 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 b_state=0x00000029, b_size=512 Sending NMI from CPU 0 to CPUs 1: device loop0 blocksize: 4096 NMI backtrace for cpu 1 CPU: 1 PID: 25307 Comm: syz-executor0 Not tainted 4.9.107-gdb2c520 #46 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801c81f3000 task.stack: ffff8801d9588000 RIP: 0010:[] c [] __sanitizer_cov_trace_pc+0x2b/0x50 kernel/kcov.c:100 RSP: 0018:ffff8801d958f7e8 EFLAGS: 00000046 RAX: ffff8801c81f3000 RBX: 0000000000000001 RCX: ffffc900079ca000 RDX: 0000000000000002 RSI: ffffffff81f1b821 RDI: ffffffff83e2dc20 RBP: ffff8801d958f7e8 R08: ffff8801c81f3960 R09: 0000000000000001 R10: 0000000000000000 R11: 1ffff1003903e727 R12: ffffffff83e2dc20 R13: ffffffff83cce920 R14: ffff8801b70bcdc8 R15: 000000000000000d FS: 00007f2e2b13a700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffdffe4d08 CR3: 0000000188b35000 CR4: 00000000001606f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffff8801d958f828c ffffffff81f1b821c ffffffff843bba18c ffffffff83cce920c ffff8801b70bcdc8c dffffc0000000000c ffff8801b70bcdc8c 000000000000000dc ffff8801d958f840c ffffffff81f1b97cc 000000000000000dc ffff8801d958f890c Call Trace: [] arch_local_save_flags arch/x86/include/asm/paravirt.h:763 [inline] [] check_preemption_disabled+0x51/0x170 lib/smp_processor_id.c:18 [] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62 [] lookup_bh_lru fs/buffer.c:1327 [inline] [] __find_get_block+0x75/0x4c0 fs/buffer.c:1356 [] __getblk_slow fs/buffer.c:1101 [inline] [] __getblk_gfp+0x189/0x710 fs/buffer.c:1386 [] __bread_gfp+0x2d/0x270 fs/buffer.c:1420 [] sb_bread include/linux/buffer_head.h:300 [inline] [] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100 [] fat_get_entry fs/fat/dir.c:128 [inline] [] __fat_readdir+0x36c/0x1840 fs/fat/dir.c:589 [] fat_readdir+0x41/0x50 fs/fat/dir.c:703 [] iterate_dir+0x1ac/0x600 fs/readdir.c:50 [] SYSC_getdents fs/readdir.c:230 [inline] [] SyS_getdents+0x13c/0x2a0 fs/readdir.c:211 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c55 c48 c89 ce5 c65 c48 c8b c04 c25 cc0 c7d c01 c00 c65 c8b c15 cfc c93 ccb c7e c81 ce2 c00 c01 c1f c00 c48 c8b c75 c08 c75 c2b c8b c90 c80 c12 c00 c00 c83 cfa c02 c75 c20 c<48> c8b c88 c88 c12 c00 c00 c8b c80 c84 c12 c00 c00 c48 c8b c11 c48 c83 cc2 c01 c48 c __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8