INFO: task syz-executor0:26902 blocked for more than 140 seconds. Not tainted 4.20.0-next-20190103 #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D27704 26902 7885 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3472 schedule+0xfe/0x350 kernel/sched/core.c:3516 __rwsem_down_write_failed_common+0xa4d/0x1620 kernel/locking/rwsem-xadd.c:577 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xa5/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:766 [inline] vfs_removexattr+0x8b/0x200 fs/xattr.c:390 removexattr+0xda/0x130 fs/xattr.c:690 path_removexattr+0x1b7/0x210 fs/xattr.c:704 __do_sys_lremovexattr fs/xattr.c:724 [inline] __se_sys_lremovexattr fs/xattr.c:721 [inline] __x64_sys_lremovexattr+0x56/0x80 fs/xattr.c:721 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:00007f3c6dc5ac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c6 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000020000140 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3c6dc5b6d4 R13: 00000000004c3a1b R14: 00000000004d6610 R15: 00000000ffffffff INFO: task syz-executor0:26912 blocked for more than 140 seconds. Not tainted 4.20.0-next-20190103 #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D26728 26912 7885 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3472 schedule+0xfe/0x350 kernel/sched/core.c:3516 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:280 [inline] rwsem_down_read_failed+0x360/0x6d0 kernel/locking/rwsem-xadd.c:297 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x9b/0x120 kernel/locking/rwsem.c:26 inode_lock_shared include/linux/fs.h:776 [inline] do_last fs/namei.c:3323 [inline] path_openat+0x25da/0x5660 fs/namei.c:3534 do_filp_open+0x26f/0x370 fs/namei.c:3564 do_sys_open+0x59a/0x7c0 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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: Bad RIP value. RSP: 002b:00007f3c6dc18c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457ec9 RDX: 0000000000000002 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 000000000073c0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3c6dc196d4 R13: 00000000004c3e4f R14: 00000000004d6eb0 R15: 00000000ffffffff INFO: task syz-executor0:26916 blocked for more than 140 seconds. Not tainted 4.20.0-next-20190103 #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D27576 26916 7885 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3472 schedule+0xfe/0x350 kernel/sched/core.c:3516 __rwsem_down_write_failed_common+0xa4d/0x1620 kernel/locking/rwsem-xadd.c:577 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xa5/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:766 [inline] vfs_removexattr+0x8b/0x200 fs/xattr.c:390 removexattr+0xda/0x130 fs/xattr.c:690 path_removexattr+0x1b7/0x210 fs/xattr.c:704 __do_sys_lremovexattr fs/xattr.c:724 [inline] __se_sys_lremovexattr fs/xattr.c:721 [inline] __x64_sys_lremovexattr+0x56/0x80 fs/xattr.c:721 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:00007f3c6dbf7c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c6 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000020000140 RBP: 000000000073c180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3c6dbf86d4 R13: 00000000004c3a1b R14: 00000000004d6610 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1040: #0: 000000008f8e6015 (rcu_read_lock){....}, at: debug_show_all_locks+0xc6/0x41d kernel/locking/lockdep.c:4389 1 lock held by rsyslogd/7759: #0: 000000005e909e6a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1b3/0x1f0 fs/file.c:795 2 locks held by getty/7850: #0: 000000002cd05543 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000f47095a6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7851: #0: 00000000fc7a6a45 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c5781ade (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7852: #0: 00000000bdec1517 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e1461cf1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7853: #0: 00000000bfbb7b29 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002420460e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7854: #0: 00000000a8dfeecd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002417c73a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7855: #0: 000000008df7cc54 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006a9c4ec7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7856: #0: 00000000f93e6677 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000105beaa4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by syz-executor2/14770: #0: 000000005779115d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000bac7faa5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 6 locks held by syz-executor0/26899: 2 locks held by syz-executor0/26902: #0: 00000000aee9970c (sb_writers#16){.+.+}, at: sb_start_write include/linux/fs.h:1615 [inline] #0: 00000000aee9970c (sb_writers#16){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:358 #1: 00000000372b53e0 (&sb->s_type->i_mutex_key#22){++++}, at: inode_lock include/linux/fs.h:766 [inline] #1: 00000000372b53e0 (&sb->s_type->i_mutex_key#22){++++}, at: vfs_removexattr+0x8b/0x200 fs/xattr.c:390 2 locks held by syz-executor0/26912: #0: 00000000aee9970c (sb_writers#16){.+.+}, at: sb_start_write include/linux/fs.h:1615 [inline] #0: 00000000aee9970c (sb_writers#16){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:358 #1: 00000000372b53e0 (&sb->s_type->i_mutex_key#22){++++}, at: inode_lock_shared include/linux/fs.h:776 [inline] #1: 00000000372b53e0 (&sb->s_type->i_mutex_key#22){++++}, at: do_last fs/namei.c:3323 [inline] #1: 00000000372b53e0 (&sb->s_type->i_mutex_key#22){++++}, at: path_openat+0x25da/0x5660 fs/namei.c:3534 2 locks held by syz-executor0/26916: #0: 00000000aee9970c (sb_writers#16){.+.+}, at: sb_start_write include/linux/fs.h:1615 [inline] #0: 00000000aee9970c (sb_writers#16){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:358 #1: 00000000372b53e0 (&sb->s_type->i_mutex_key#22){++++}, at: inode_lock include/linux/fs.h:766 [inline] #1: 00000000372b53e0 (&sb->s_type->i_mutex_key#22){++++}, at: vfs_removexattr+0x8b/0x200 fs/xattr.c:390 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 4.20.0-next-20190103 #5 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:203 [inline] watchdog+0xbbb/0x1170 kernel/hung_task.c:287 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: 26899 Comm: syz-executor0 Not tainted 4.20.0-next-20190103 #5 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:number+0xb5d/0xc80 lib/vsprintf.c:468 Code: ff ff e8 d6 f9 91 f9 8b 9d 04 ff ff ff 83 eb 02 e9 49 fa ff ff e8 c3 f9 91 f9 83 eb 01 e9 f8 fb ff ff 4d 89 fe e9 6c fd ff ff ae f9 91 f9 49 8d 45 a0 4c 89 e6 48 89 c7 48 89 c3 48 89 85 28 RSP: 0018:ffff888050d667e8 EFLAGS: 00000046 RAX: 0000000000000002 RBX: 000000000000000a RCX: ffffffff87efff19 RDX: 000000000000000a RSI: 000000000000000a RDI: 0000000000000001 RBP: ffff888050d66908 R08: ffff88805498a4c0 R09: ffffed100a1acd6e R10: ffffed100a1acd6d R11: ffff888050d66b68 R12: 0000000000000544 R13: ffff888050d668e0 R14: 0000000000000000 R15: ffff888050d66b69 FS: 00007f3c6dc7c700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000009ac130 CR3: 00000000a38eb000 CR4: 00000000001406e0 Call Trace: vsnprintf+0x2a9/0x1b10 lib/vsprintf.c:2462 sprintf+0xc0/0x100 lib/vsprintf.c:2598 print_time kernel/printk/printk.c:1264 [inline] print_prefix kernel/printk/printk.c:1290 [inline] msg_print_text+0x543/0x5d0 kernel/printk/printk.c:1309 console_unlock+0x41e/0x1040 kernel/printk/printk.c:2430 vprintk_emit+0x370/0x960 kernel/printk/printk.c:1978 vprintk_default+0x28/0x30 kernel/printk/printk.c:2005 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:2038 __find_get_block_slow fs/buffer.c:237 [inline] __find_get_block fs/buffer.c:1325 [inline] __find_get_block.cold+0xd4/0xfb fs/buffer.c:1319 __getblk_slow fs/buffer.c:1058 [inline] __getblk_gfp+0x3c5/0x1130 fs/buffer.c:1351 __bread_gfp+0x2f/0x300 fs/buffer.c:1385 sb_bread include/linux/buffer_head.h:307 [inline] fat__get_entry+0x586/0xa40 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_search_long+0x345/0x17d0 fs/fat/dir.c:479 vfat_find+0x10e/0x140 fs/fat/namei_vfat.c:697 vfat_lookup+0x10a/0x6b0 fs/fat/namei_vfat.c:711 lookup_open+0x726/0x1b80 fs/namei.c:3213 do_last fs/namei.c:3324 [inline] path_openat+0x25f6/0x5660 fs/namei.c:3534 do_filp_open+0x26f/0x370 fs/namei.c:3564 do_sys_open+0x59a/0x7c0 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+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:00007f3c6dc7bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457ec9 RDX: 0000000000000002 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3c6dc7c6d4 R13: 00000000004c3e4f R14: 00000000004d6eb0 R15: 00000000ffffffff