RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000411e71 RDX: 0000000000000000 RSI: 0000000000024001 RDI: 00007f8a8f743850 RBP: 000000000073bf00 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000064 R11: 0000000000000293 R12: 00007f8a8f7446d4 R13: 00000000004c67fb R14: 00000000004db818 R15: 0000000000000004 INFO: task syz-executor0:18997 blocked for more than 140 seconds. Not tainted 4.20.0+ #9 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D27624 18997 7496 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e90 kernel/sched/core.c:3472 schedule+0xfe/0x350 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xa3b/0x1670 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 lock_fat fs/fat/fatent.c:279 [inline] fat_count_free_clusters+0x11b/0xe50 fs/fat/fatent.c:658 fat_statfs+0x3b0/0x4c0 fs/fat/inode.c:822 statfs_by_dentry fs/statfs.c:64 [inline] statfs_by_dentry+0x13d/0x220 fs/statfs.c:53 vfs_statfs+0x47/0x2d0 fs/statfs.c:74 user_statfs+0xbd/0x150 fs/statfs.c:89 __do_sys_statfs+0x88/0x100 fs/statfs.c:179 __se_sys_statfs fs/statfs.c:176 [inline] __x64_sys_statfs+0x54/0x80 fs/statfs.c:176 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: Bad RIP value. RSP: 002b:00007fa9880dbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000089 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 000000000073c180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa9880dc6d4 R13: 00000000004be73f R14: 00000000004daf90 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1039: #0: 0000000032943327 (rcu_read_lock){....}, at: debug_show_all_locks+0xc6/0x41d kernel/locking/lockdep.c:4389 1 lock held by rsyslogd/7347: #0: 00000000274d75ca (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1b3/0x1f0 fs/file.c:795 2 locks held by getty/7458: #0: 000000004836de47 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000bddb93f1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7459: #0: 00000000c1e59498 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000de255ca9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7460: #0: 00000000e7f94829 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000036caa9bd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7461: #0: 0000000067b92fb8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000bbb791dd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7462: #0: 000000005cac8a03 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000284c0e92 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7463: #0: 000000006f575e79 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000037cce208 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7464: #0: 00000000a0d8313f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007888bb72 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 1 lock held by syz-executor0/18952: 1 lock held by syz-executor0/18997: #0: 0000000094802051 (&sbi->fat_lock){+.+.}, at: lock_fat fs/fat/fatent.c:279 [inline] #0: 0000000094802051 (&sbi->fat_lock){+.+.}, at: fat_count_free_clusters+0x11b/0xe50 fs/fat/fatent.c:658 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1039 Comm: khungtaskd Not tainted 4.20.0+ #9 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+0x1db/0x2d0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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+0xbd2/0x10b0 kernel/hung_task.c:289 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 18952 Comm: syz-executor0 Not tainted 4.20.0+ #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:write_comp_data+0x0/0x70 kernel/kcov.c:121 Code: 83 fa 02 75 20 48 8b 88 e0 12 00 00 8b 80 dc 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 <65> 4c 8b 04 25 40 ee 01 00 65 8b 05 20 f8 7f 7e a9 00 01 1f 00 75 RSP: 0018:ffff888054a77268 EFLAGS: 00000206 RAX: 0000000000000003 RBX: ffff888054a77450 RCX: ffffffff87f04056 RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000007 RBP: ffff888054a77270 R08: ffff8880838983c0 R09: ffffed1015ce5b90 R10: ffffed1015ce5b8f R11: ffff8880ae72dc7b R12: 1ffff1100a94ee52 R13: 0000000000000003 R14: ffff888054a77330 R15: ffff888054a77468 FS: 00007fa988160700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000082d5a000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: xas_start+0xb6/0x720 lib/xarray.c:177 xas_load+0x21/0x160 lib/xarray.c:227 find_get_entry+0x350/0x10a0 mm/filemap.c:1476 pagecache_get_page+0xe6/0x1020 mm/filemap.c:1579 find_or_create_page include/linux/pagemap.h:322 [inline] grow_dev_page fs/buffer.c:947 [inline] grow_buffers fs/buffer.c:1016 [inline] __getblk_slow fs/buffer.c:1043 [inline] __getblk_gfp+0x38a/0xd20 fs/buffer.c:1320 __bread_gfp+0x2f/0x300 fs/buffer.c:1354 sb_bread include/linux/buffer_head.h:307 [inline] fat_ent_bread+0x16c/0x290 fs/fat/fatent.c:107 fat_ent_read_block fs/fat/fatent.c:442 [inline] fat_count_free_clusters+0x68c/0xe50 fs/fat/fatent.c:677 fat_statfs+0x3b0/0x4c0 fs/fat/inode.c:822 statfs_by_dentry fs/statfs.c:64 [inline] statfs_by_dentry+0x13d/0x220 fs/statfs.c:53 vfs_statfs+0x47/0x2d0 fs/statfs.c:74 user_statfs+0xbd/0x150 fs/statfs.c:89 __do_sys_statfs+0x88/0x100 fs/statfs.c:179 __se_sys_statfs fs/statfs.c:176 [inline] __x64_sys_statfs+0x54/0x80 fs/statfs.c:176 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa98815fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000089 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa9881606d4 R13: 00000000004be73f R14: 00000000004daf90 R15: 00000000ffffffff