INFO: task kworker/u4:15:11368 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:15 D27200 11368 2 0x80000000 Workqueue: writeback wb_workfn (flush-7:4) Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 queue_log_writer+0x27a/0x2d0 fs/reiserfs/journal.c:2990 check_journal_end fs/reiserfs/journal.c:3687 [inline] do_journal_end+0x8c0/0x4840 fs/reiserfs/journal.c:4054 reiserfs_write_inode+0x27a/0x2d0 fs/reiserfs/inode.c:1789 write_inode fs/fs-writeback.c:1244 [inline] __writeback_single_inode+0x733/0x11d0 fs/fs-writeback.c:1442 writeback_sb_inodes+0x537/0xef0 fs/fs-writeback.c:1647 wb_writeback+0x28d/0xcc0 fs/fs-writeback.c:1820 wb_do_writeback fs/fs-writeback.c:1965 [inline] wb_workfn+0x29b/0x1250 fs/fs-writeback.c:2006 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task syz-executor.4:14773 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D25336 14773 8137 0x00000006 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 bit_wait+0x12/0x90 kernel/sched/wait_bit.c:197 __wait_on_bit+0x7e/0x150 kernel/sched/wait_bit.c:48 __inode_wait_for_writeback+0x153/0x1f0 fs/fs-writeback.c:1265 inode_wait_for_writeback+0x22/0x30 fs/fs-writeback.c:1277 evict+0x2b7/0x760 fs/inode.c:556 iput_final fs/inode.c:1555 [inline] iput+0x4f1/0x860 fs/inode.c:1581 dentry_unlink_inode+0x265/0x320 fs/dcache.c:374 d_delete+0x210/0x280 fs/dcache.c:2372 xattr_unlink+0x139/0x190 fs/reiserfs/xattr.c:96 lookup_and_delete_xattr fs/reiserfs/xattr.c:492 [inline] reiserfs_xattr_set_handle+0x88e/0xb40 fs/reiserfs/xattr.c:527 reiserfs_xattr_set+0x411/0x570 fs/reiserfs/xattr.c:631 trusted_set+0xa6/0xd0 fs/reiserfs/xattr_trusted.c:30 __vfs_removexattr+0xf3/0x160 fs/xattr.c:413 __vfs_removexattr_locked+0x15c/0x340 fs/xattr.c:445 vfs_removexattr+0xc1/0x240 fs/xattr.c:466 ovl_make_workdir fs/overlayfs/super.c:1139 [inline] ovl_get_workdir fs/overlayfs/super.c:1198 [inline] ovl_fill_super+0x13f9/0x3f10 fs/overlayfs/super.c:1601 mount_nodev+0x60/0x110 fs/super.c:1204 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f88d07210c9 Code: Bad RIP value. RSP: 002b:00007f88cec93168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f88d0840f80 RCX: 00007f88d07210c9 RDX: 0000000020000080 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 00007f88d077cae9 R08: 0000000020000480 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd344c15bf R14: 00007f88cec93300 R15: 0000000000022000 INFO: task syz-executor.4:14815 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29128 14815 8137 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 wb_wait_for_completion+0x175/0x1f0 fs/fs-writeback.c:222 sync_inodes_sb+0x19d/0x9a0 fs/fs-writeback.c:2459 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem+0x15c/0x250 fs/sync.c:67 reiserfs_remount+0x150/0x1540 fs/reiserfs/super.c:1458 do_remount_sb+0x1a0/0x6a0 fs/super.c:888 do_remount fs/namespace.c:2313 [inline] do_mount+0x1a62/0x2f50 fs/namespace.c:2813 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f88d07225fa Code: Bad RIP value. RSP: 002b:00007f88c6c50f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f88d07225fa RDX: 00000000200000c0 RSI: 0000000020000100 RDI: 0000000000000000 RBP: 00007f88c6c51020 R08: 00007f88c6c51020 R09: 0000000001a484bc R10: 0000000001a484bc R11: 0000000000000202 R12: 00000000200000c0 R13: 0000000020000100 R14: 00007f88c6c50fe0 R15: 00000000200009c0 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 000000004e681d06 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7807: #0: 00000000eb16d657 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by kworker/u4:15/11368: #0: 00000000bf5b953e ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 000000009a42bde6 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 4 locks held by syz-executor.4/14773: #0: 000000001ac6fc57 (&type->s_umount_key#67/1){+.+.}, at: alloc_super fs/super.c:226 [inline] #0: 000000001ac6fc57 (&type->s_umount_key#67/1){+.+.}, at: sget_userns+0x20b/0xcd0 fs/super.c:519 #1: 0000000006b5a7af (sb_writers#22){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #1: 0000000006b5a7af (sb_writers#22){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #2: 00000000e58de6ff (&type->i_mutex_dir_key#11){++++}, at: inode_lock include/linux/fs.h:748 [inline] #2: 00000000e58de6ff (&type->i_mutex_dir_key#11){++++}, at: vfs_removexattr+0xb2/0x240 fs/xattr.c:465 #3: 0000000079808d05 (&type->i_mutex_dir_key#11/3){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #3: 0000000079808d05 (&type->i_mutex_dir_key#11/3){+.+.}, at: lookup_and_delete_xattr fs/reiserfs/xattr.c:484 [inline] #3: 0000000079808d05 (&type->i_mutex_dir_key#11/3){+.+.}, at: reiserfs_xattr_set_handle+0x7fd/0xb40 fs/reiserfs/xattr.c:527 2 locks held by syz-executor.4/14815: #0: 000000004b5a437a (&type->s_umount_key#63){++++}, at: do_remount fs/namespace.c:2307 [inline] #0: 000000004b5a437a (&type->s_umount_key#63){++++}, at: do_mount+0xa5b/0x2f50 fs/namespace.c:2813 #1: 0000000054be053e (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000054be053e (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 8 locks held by syz-executor.0/19060: 1 lock held by syz-executor.3/19125: 2 locks held by syz-executor.4/19128: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11468 Comm: kworker/u4:21 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:lock_release+0x454/0x8b0 kernel/locking/lockdep.c:3931 Code: 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 49 c7 04 04 00 00 00 00 48 8b 44 24 70 65 48 2b 04 25 28 00 00 00 0f 85 67 03 00 00 <48> 83 c4 78 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b 05 d6 32 b6 7e RSP: 0000:ffff888064ebfc00 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88806c28a100 RCX: 1ffff1100d85153b RDX: dffffc0000000000 RSI: 0000000000000003 RDI: 0000000000000286 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1100c9d7f83 R13: 9cfb8927f9a08238 R14: ffff88806c28a100 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3a1084f000 CR3: 00000000aa323000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:247 [inline] rcu_read_unlock include/linux/rcupdate.h:681 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:423 [inline] batadv_nc_worker+0x66c/0xd50 net/batman-adv/network-coding.c:730 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415