INFO: task syz.4.4611:14824 blocked for more than 143 seconds. Not tainted 5.15.164-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.4611 state:D stack:22176 pid:14824 ppid: 4044 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5030 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376 schedule+0x11b/0x1f0 kernel/sched/core.c:6459 xlog_grant_head_wait+0x381/0x900 fs/xfs/xfs_log.c:256 xlog_grant_head_check+0x295/0x480 xfs_log_reserve+0x3b8/0xb10 fs/xfs/xfs_log.c:464 xfs_trans_reserve+0x23d/0x690 fs/xfs/xfs_trans.c:197 xfs_trans_alloc+0x420/0x7f0 fs/xfs/xfs_trans.c:288 xfs_trans_alloc_inode+0x129/0x450 fs/xfs/xfs_trans.c:1047 xfs_attr_set+0x848/0x1460 fs/xfs/libxfs/xfs_attr.c:772 xfs_xattr_set+0x227/0x3a0 fs/xfs/xfs_xattr.c:59 __vfs_setxattr+0x3e7/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 vfs_setxattr+0x21d/0x420 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x27e/0x2e0 fs/xattr.c:611 path_setxattr+0x1bc/0x2a0 fs/xattr.c:630 __do_sys_setxattr fs/xattr.c:646 [inline] __se_sys_setxattr fs/xattr.c:642 [inline] __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:642 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f02024249b9 RSP: 002b:00007f02008a1038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007f02025c0f80 RCX: 00007f02024249b9 RDX: 0000000020000100 RSI: 0000000020000340 RDI: 0000000020000040 RBP: 00007f02024928d8 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fc21 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f02025c0f80 R15: 00007ffe9a6610a8 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by kworker/u4:2/154: 1 lock held by udevd/3026: #0: ffff88801b5ec118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x14d/0xa50 block/bdev.c:817 2 locks held by getty/3321: #0: ffff888024aea098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc9000229b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158 2 locks held by kworker/1:10/4026: #0: ffff888011c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc90002f57d20 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 1 lock held by syz-executor/4039: #0: ffffffff8c9240e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #0: ffffffff8c9240e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x280/0x740 kernel/rcu/tree_exp.h:845 2 locks held by kworker/0:19/6361: #0: ffff8880617ead38 ((wq_completion)xfs-sync/loop4){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc90003377d20 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 3 locks held by syz.4.4611/14824: #0: ffff888074d06460 (sb_writers#28){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377 #1: ffff8880618bec00 (&inode->i_sb->s_type->i_mutex_dir_key){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #1: ffff8880618bec00 (&inode->i_sb->s_type->i_mutex_dir_key){++++}-{3:3}, at: vfs_setxattr+0x1dd/0x420 fs/xattr.c:302 #2: ffff888074d06650 (sb_internal#3){.+.+}-{0:0}, at: xfs_trans_alloc_inode+0x129/0x450 fs/xfs/xfs_trans.c:1047 1 lock held by syz.3.4996/15793: 2 locks held by syz.0.7345/20969: #0: ffff88801b5ec118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfb/0x790 block/bdev.c:912 #1: ffff88801b537468 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:2070 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.164-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xe72/0xeb0 kernel/hung_task.c:295 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 15793 Comm: syz.3.4996 Not tainted 5.15.164-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:__find_get_block+0x642/0x1350 fs/buffer.c:1310 Code: 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 c0 a6 e4 ff 4d 8b 24 24 4d 39 f4 0f 84 5c 09 00 00 e8 ce d2 9a ff 01 48 89 44 24 20 e9 f7 fe ff ff 4c 89 ee 48 f7 de 31 ff e8 95 RSP: 0018:ffffc900031270c0 EFLAGS: 00000246 RAX: ffffffff81e58e92 RBX: 0000000000000000 RCX: 0000000000040000 RDX: ffffc9000a693000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc90003127218 R08: ffffffff81e58dd3 R09: ffffed1009ba25b4 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88804dd12cb0 R13: ffff888140898a80 R14: ffff88804dd12d98 R15: ffffea0001441980 FS: 00007fe5636f46c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f12d37252d8 CR3: 000000001a31d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __getblk_gfp+0x2d/0xaf0 fs/buffer.c:1332 __bread_gfp+0x2a/0x390 fs/buffer.c:1381 sb_bread include/linux/buffer_head.h:337 [inline] get_branch+0x2c3/0x6e0 fs/sysv/itree.c:101 get_block+0x16c/0x1790 fs/sysv/itree.c:221 block_read_full_page+0x2f9/0xde0 fs/buffer.c:2290 do_read_cache_page+0x752/0x1040 read_mapping_page include/linux/pagemap.h:515 [inline] dir_get_page fs/sysv/dir.c:58 [inline] sysv_find_entry+0x1b0/0x650 fs/sysv/dir.c:146 sysv_inode_by_name+0x9e/0x3f0 fs/sysv/dir.c:360 sysv_lookup+0x63/0xe0 fs/sysv/namei.c:38 lookup_open fs/namei.c:3440 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x111d/0x2f20 fs/namei.c:3739 do_filp_open+0x21c/0x460 fs/namei.c:3769 do_sys_openat2+0x13b/0x4f0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1280 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fe5652779b9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe5636f4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fe565413f80 RCX: 00007fe5652779b9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 00007fe5652e58d8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe565413f80 R15: 00007ffe79594288