INFO: task syz-executor.4:10044 blocked for more than 143 seconds. Not tainted 6.1.86-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:24800 pid:10044 ppid:8860 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x142d/0x4550 kernel/sched/core.c:6558 schedule+0xbf/0x180 kernel/sched/core.c:6634 xlog_grant_head_wait+0x3b6/0xa00 fs/xfs/xfs_log.c:307 xlog_grant_head_check+0x295/0x480 xfs_log_reserve+0x3e1/0xc30 fs/xfs/xfs_log.c:486 xfs_trans_reserve+0x239/0x6a0 fs/xfs/xfs_trans.c:194 xfs_trans_alloc+0x41e/0x890 fs/xfs/xfs_trans.c:283 xfs_trans_alloc_inode+0x129/0x450 fs/xfs/xfs_trans.c:1191 xfs_attr_set+0xa4e/0x1660 fs/xfs/libxfs/xfs_attr.c:1024 xfs_attr_change fs/xfs/xfs_xattr.c:106 [inline] xfs_xattr_set+0x227/0x3a0 fs/xfs/xfs_xattr.c:151 __vfs_setxattr+0x3e7/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 vfs_setxattr+0x21d/0x420 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x250/0x2b0 fs/xattr.c:617 path_setxattr+0x1bc/0x2a0 fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:655 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fd61ea7de69 RSP: 002b:00007fd61f7070c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007fd61ebabf80 RCX: 00007fd61ea7de69 RDX: 0000000020000100 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 00007fd61eaca47a R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fffe R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fd61ebabf80 R15: 00007fff486d8f78 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8d12ae10 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516 1 lock held by rcu_tasks_trace/13: #0: ffffffff8d12b610 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516 1 lock held by khungtaskd/28: #0: ffffffff8d12ac40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8d12ac40 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8d12ac40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494 1 lock held by udevd/3004: 2 locks held by getty/3305: #0: ffff88814bb52098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2188 3 locks held by syz-executor.4/10044: #0: ffff8880635f0460 (sb_writers#21){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 #1: ffff888052fce7f8 (&inode->i_sb->s_type->i_mutex_dir_key){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff888052fce7f8 (&inode->i_sb->s_type->i_mutex_dir_key){++++}-{3:3}, at: vfs_setxattr+0x1dd/0x420 fs/xattr.c:308 #2: ffff8880635f0650 (sb_internal#2){.+.+}-{0:0}, at: xfs_trans_alloc_inode+0x129/0x450 fs/xfs/xfs_trans.c:1191 3 locks held by syz-executor.0/10167: #0: ffff888058de0460 (sb_writers#21){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 #1: ffff888052dfc138 (&inode->i_sb->s_type->i_mutex_dir_key){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff888052dfc138 (&inode->i_sb->s_type->i_mutex_dir_key){++++}-{3:3}, at: vfs_setxattr+0x1dd/0x420 fs/xattr.c:308 #2: ffff888058de0650 (sb_internal#2){.+.+}-{0:0}, at: xfs_trans_alloc_inode+0x129/0x450 fs/xfs/xfs_trans.c:1191 1 lock held by syz-executor.1/12984: #0: ffff8881437ab4c8 (&disk->open_mutex){+.+.}-{3:3}, at: loop_reread_partitions drivers/block/loop.c:515 [inline] #0: ffff8881437ab4c8 (&disk->open_mutex){+.+.}-{3:3}, at: loop_set_status+0x710/0x910 drivers/block/loop.c:1320 4 locks held by syz-executor.3/13004: #0: ffff88805b83d098 (&tty->ldisc_sem){++++}-{0:0}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:290 [inline] #0: ffff88805b83d098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock_pair_timeout drivers/tty/tty_ldisc.c:346 [inline] #0: ffff88805b83d098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock_pair drivers/tty/tty_ldisc.c:367 [inline] #0: ffff88805b83d098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_release+0xb3/0x200 drivers/tty/tty_ldisc.c:775 #1: ffff888073973098 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: __tty_ldisc_lock_nested drivers/tty/tty_ldisc.c:296 [inline] #1: ffff888073973098 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: tty_ldisc_lock_pair_timeout drivers/tty/tty_ldisc.c:348 [inline] #1: ffff888073973098 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: tty_ldisc_lock_pair drivers/tty/tty_ldisc.c:367 [inline] #1: ffff888073973098 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: tty_ldisc_release+0xd7/0x200 drivers/tty/tty_ldisc.c:775 #2: ffffffff8e299e28 (rtnl_mutex){+.+.}-{3:3}, at: unregister_netdev+0x79/0x210 net/core/dev.c:10939 #3: ffffffff8d130238 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #3: ffffffff8d130238 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4f0/0x930 kernel/rcu/tree_exp.h:962 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.86-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 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+0xf88/0xfd0 kernel/hung_task.c:377 kthread+0x28d/0x320 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: 3560 Comm: syz-fuzzer Not tainted 6.1.86-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0033:0x471c84 Code: 7f 20 f3 44 0f 7f 7f 30 f3 44 0f 7f 7c 1f c0 f3 44 0f 7f 7c 1f d0 f3 44 0f 7f 7c 1f e0 f3 44 0f 7f 7c 1f f0 c3 f3 44 0f 7f 3f 44 0f 7f 7f 10 f3 44 0f 7f 7f 20 f3 44 0f 7f 7f 30 f3 44 0f 7f RSP: 002b:000000c000386690 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000100 RCX: 000000c000732400 RDX: 00007f4bbe67b108 RSI: 0000000000b27200 RDI: 000000c0004cb100 RBP: 000000c0003866f0 R08: 0000000000000000 R09: 0000000000000100 R10: 00007f4b7783c798 R11: 000000c0004cb100 R12: 0000000000000001 R13: 0000000000000012 R14: 000000c0000061a0 R15: 0000000000000011 FS: 000000c000732490 GS: 0000000000000000