INFO: task kworker/u4:5:76 blocked for more than 143 seconds. Not tainted 6.2.0-rc4-syzkaller-00041-gc1649ec55708 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:5 state:D stack:17376 pid:76 ppid:2 flags:0x00004000 Workqueue: writeback wb_workfn (flush-7:1) Call Trace: context_switch kernel/sched/core.c:5293 [inline] __schedule+0x995/0xe20 kernel/sched/core.c:6606 schedule+0xcb/0x190 kernel/sched/core.c:6682 queue_log_writer+0x215/0x300 fs/reiserfs/journal.c:2980 check_journal_end fs/reiserfs/journal.c:3676 [inline] do_journal_end+0xa38/0x4a30 fs/reiserfs/journal.c:4042 reiserfs_write_inode+0x1f8/0x2a0 fs/reiserfs/inode.c:1779 write_inode fs/fs-writeback.c:1451 [inline] __writeback_single_inode+0x4d6/0x670 fs/fs-writeback.c:1663 writeback_sb_inodes+0x812/0x1050 fs/fs-writeback.c:1889 wb_writeback+0x41f/0x7b0 fs/fs-writeback.c:2063 wb_do_writeback fs/fs-writeback.c:2206 [inline] wb_workfn+0x3cb/0xef0 fs/fs-writeback.c:2246 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 INFO: task syz-executor.1:7409 blocked for more than 143 seconds. Not tainted 6.2.0-rc4-syzkaller-00041-gc1649ec55708 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:18336 pid:7409 ppid:5121 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5293 [inline] __schedule+0x995/0xe20 kernel/sched/core.c:6606 schedule+0xcb/0x190 kernel/sched/core.c:6682 bit_wait+0xe/0xc0 kernel/sched/wait_bit.c:199 __wait_on_bit+0xb5/0x170 kernel/sched/wait_bit.c:49 __inode_wait_for_writeback fs/fs-writeback.c:1472 [inline] inode_wait_for_writeback+0x211/0x2c0 fs/fs-writeback.c:1484 evict+0x277/0x620 fs/inode.c:661 xattr_unlink fs/reiserfs/xattr.c:96 [inline] lookup_and_delete_xattr fs/reiserfs/xattr.c:494 [inline] reiserfs_xattr_set_handle+0xae5/0xec0 fs/reiserfs/xattr.c:529 reiserfs_xattr_set+0x417/0x530 fs/reiserfs/xattr.c:633 __vfs_removexattr+0x44a/0x480 fs/xattr.c:497 __vfs_removexattr_locked+0x1fe/0x400 fs/xattr.c:532 vfs_removexattr+0x104/0x2b0 fs/xattr.c:554 ovl_do_removexattr fs/overlayfs/overlayfs.h:272 [inline] ovl_removexattr fs/overlayfs/overlayfs.h:280 [inline] ovl_make_workdir+0x5b9/0xdf0 fs/overlayfs/super.c:1361 ovl_get_workdir+0x2e4/0x410 fs/overlayfs/super.c:1444 ovl_fill_super+0x19d7/0x2790 fs/overlayfs/super.c:2000 mount_nodev+0x52/0xe0 fs/super.c:1405 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb36848c0c9 RSP: 002b:00007fb36919f168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fb3685abf80 RCX: 00007fb36848c0c9 RDX: 0000000020000080 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 00007fb3684e7ae9 R08: 0000000020000480 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdb7bce30f R14: 00007fb36919f300 R15: 0000000000022000 INFO: task syz-executor.1:7443 blocked for more than 144 seconds. Not tainted 6.2.0-rc4-syzkaller-00041-gc1649ec55708 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:22552 pid:7443 ppid:5121 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5293 [inline] __schedule+0x995/0xe20 kernel/sched/core.c:6606 schedule+0xcb/0x190 kernel/sched/core.c:6682 wb_wait_for_completion+0x155/0x280 fs/fs-writeback.c:192 sync_inodes_sb+0x283/0xaa0 fs/fs-writeback.c:2725 sync_filesystem+0x16b/0x220 fs/sync.c:64 reiserfs_remount+0x1a9/0x19d0 fs/reiserfs/super.c:1445 reconfigure_super+0x3bc/0x7b0 fs/super.c:935 do_remount fs/namespace.c:2807 [inline] path_mount+0xd20/0x10c0 fs/namespace.c:3467 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb36848d5fa RSP: 002b:00007fb36917df88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb36848d5fa RDX: 00000000200000c0 RSI: 0000000020000100 RDI: 0000000000000000 RBP: 00007fb36917e020 R08: 00007fb36917e020 R09: 0000000001a484bc R10: 0000000001a484bc R11: 0000000000000206 R12: 00000000200000c0 R13: 0000000020000100 R14: 00007fb36917dfe0 R15: 00000000200007c0 INFO: task syz-executor.0:7449 blocked for more than 144 seconds. Not tainted 6.2.0-rc4-syzkaller-00041-gc1649ec55708 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:25192 pid:7449 ppid:5113 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5293 [inline] __schedule+0x995/0xe20 kernel/sched/core.c:6606 schedule+0xcb/0x190 kernel/sched/core.c:6682 rwsem_down_read_slowpath+0x5f9/0x930 kernel/locking/rwsem.c:1095 __down_read_common+0x54/0x2a0 kernel/locking/rwsem.c:1260 iterate_supers+0xb0/0x1f0 fs/super.c:722 ksys_sync+0xb7/0x1c0 fs/sync.c:102 __do_sys_sync+0xa/0x10 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f08e1e8c0c9 RSP: 002b:00007f08e2b68168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f08e1fabf80 RCX: 00007f08e1e8c0c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f08e1ee7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf9a6498f R14: 00007f08e2b68300 R15: 0000000000022000 INFO: task syz-executor.0:7452 blocked for more than 144 seconds. Not tainted 6.2.0-rc4-syzkaller-00041-gc1649ec55708 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:25032 pid:7452 ppid:5113 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5293 [inline] __schedule+0x995/0xe20 kernel/sched/core.c:6606 schedule+0xcb/0x190 kernel/sched/core.c:6682 rwsem_down_read_slowpath+0x5f9/0x930 kernel/locking/rwsem.c:1095 __down_read_common+0x54/0x2a0 kernel/locking/rwsem.c:1260 iterate_supers+0xb0/0x1f0 fs/super.c:722 ksys_sync+0xb7/0x1c0 fs/sync.c:102 __do_sys_sync+0xa/0x10 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f08e1e8c0c9 RSP: 002b:00007f08e2b47168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f08e1fac050 RCX: 00007f08e1e8c0c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f08e1ee7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf9a6498f R14: 00007f08e2b47300 R15: 0000000000022000 INFO: task syz-executor.0:7461 blocked for more than 144 seconds. Not tainted 6.2.0-rc4-syzkaller-00041-gc1649ec55708 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:23552 pid:7461 ppid:5113 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5293 [inline] __schedule+0x995/0xe20 kernel/sched/core.c:6606 schedule+0xcb/0x190 kernel/sched/core.c:6682 rwsem_down_read_slowpath+0x5f9/0x930 kernel/locking/rwsem.c:1095 __down_read_common+0x54/0x2a0 kernel/locking/rwsem.c:1260 iterate_supers+0xb0/0x1f0 fs/super.c:722 ksys_sync+0xb7/0x1c0 fs/sync.c:102 __do_sys_sync+0xa/0x10 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f08e1e8c0c9 RSP: 002b:00007f08e2b26168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f08e1fac120 RCX: 00007f08e1e8c0c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f08e1ee7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf9a6498f R14: 00007f08e2b26300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8d326fd0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8d3277d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/28: #0: ffffffff8d326e00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by kworker/u4:4/63: #0: ffff8880b983a1d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x110 kernel/sched/core.c:537 #1: ffff8880b9827748 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x611/0x9a0 kernel/sched/psi.c:976 2 locks held by kworker/u4:5/76: #0: ffff888145264938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90001587d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by getty/4747: #0: ffff88823bc96898 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x53b/0x1650 drivers/tty/n_tty.c:2177 4 locks held by syz-executor.1/7409: #0: ffff88803848c0e0 (&type->s_umount_key#71/1){+.+.}-{3:3}, at: alloc_super+0x212/0x920 fs/super.c:228 #1: ffff888066a78460 (sb_writers#25){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:508 #2: ffff88803358c520 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #2: ffff88803358c520 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: vfs_removexattr+0xed/0x2b0 fs/xattr.c:553 #3: ffff88803358dfa0 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:791 [inline] #3: ffff88803358dfa0 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: lookup_and_delete_xattr fs/reiserfs/xattr.c:486 [inline] #3: ffff88803358dfa0 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: reiserfs_xattr_set_handle+0x521/0xec0 fs/reiserfs/xattr.c:529 2 locks held by syz-executor.1/7443: #0: ffff888066a780e0 (&type->s_umount_key#101){++++}-{3:3}, at: do_remount fs/namespace.c:2804 [inline] #0: ffff888066a780e0 (&type->s_umount_key#101){++++}-{3:3}, at: path_mount+0xcd8/0x10c0 fs/namespace.c:3467 #1: ffff88801eee87d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline] #1: ffff88801eee87d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x264/0xaa0 fs/fs-writeback.c:2723 1 lock held by syz-executor.0/7449: #0: ffff888066a780e0 (&type->s_umount_key#101){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 1 lock held by syz-executor.0/7452: #0: ffff888066a780e0 (&type->s_umount_key#101){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 1 lock held by syz-executor.0/7461: #0: ffff888066a780e0 (&type->s_umount_key#101){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 1 lock held by syz-executor.0/7704: #0: ffff888066a780e0 (&type->s_umount_key#101){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 1 lock held by syz-executor.0/7706: #0: ffff888066a780e0 (&type->s_umount_key#101){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 1 lock held by syz-executor.0/7802: #0: ffff888066a780e0 (&type->s_umount_key#101){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 1 lock held by syz-executor.0/7803: #0: ffff888066a780e0 (&type->s_umount_key#101){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 1 lock held by syz-executor.0/7804: #0: ffff888066a780e0 (&type->s_umount_key#101){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc4-syzkaller-00041-gc1649ec55708 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106 nmi_cpu_backtrace+0x46f/0x4f0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1ba/0x420 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xcd5/0xd20 kernel/hung_task.c:377 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4417 Comm: syslogd Not tainted 6.2.0-rc4-syzkaller-00041-gc1649ec55708 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 RIP: 0010:__stack_depot_save+0x1a/0x4a0 lib/stackdepot.c:423 Code: 89 f6 e8 39 4d 00 00 eb bc 0f 1f 80 00 00 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 30 44 89 c3 41 89 cc 41 89 d6 49 89 ff <65> 48 8b 04 25 28 00 00 00 48 89 44 24 28 48 c7 44 24 20 00 00 00 RSP: 0018:ffffc90005887668 EFLAGS: 00000282 RAX: 000000000000000b RBX: 0000000000000001 RCX: 0000000000000800 RDX: 0000000000000000 RSI: 000000000000000b RDI: ffffc900058876d0 RBP: ffffc90005887900 R08: 0000000000000001 R09: fffffbfff1d2d27e R10: fffffbfff1d2d27e R11: 1ffffffff1d2d27d R12: 0000000000000800 R13: ffffffff81e0b7f4 R14: 0000000000000000 R15: ffffc900058876d0 FS: 00007fe8034a1800(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560fc19170c0 CR3: 000000002aaec000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x52/0x60 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] kmem_cache_free+0x94/0x1d0 mm/slub.c:3809 __unix_dgram_recvmsg+0xc3a/0x1170 net/unix/af_unix.c:2525 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_read_iter+0x3fa/0x530 net/socket.c:1086 call_read_iter include/linux/fs.h:2183 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7ac/0xbf0 fs/read_write.c:470 ksys_read+0x177/0x2a0 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe80362d8fe Code: c0 e9 e6 fe ff ff 50 48 8d 3d 0e c7 09 00 e8 c9 cf 01 00 66 0f 1f 84 00 00 00 00 00 64 8b 04 25 18 00 00 00 85 c0 75 14 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 66 0f 1f 84 00 00 00 00 00 48 83 ec 28 RSP: 002b:00007fff15f2f378 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fe80362d8fe RDX: 00000000000000ff RSI: 000055d84ea11950 RDI: 0000000000000000 RBP: 000055d84ea11910 R08: 00007fe8036bd040 R09: 00007fe8036bd0c0 R10: 00007fe8036bcfc0 R11: 0000000000000246 R12: 000055d84ea1199b R13: 000055d84ea11950 R14: 0000000000000000 R15: 0000000000000000