INFO: task syz-fuzzer:5082 blocked for more than 143 seconds. Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-fuzzer state:D stack:21840 pid:5082 tgid:5062 ppid:5060 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0x17d3/0x4a20 kernel/sched/core.c:6736 __schedule_loop kernel/sched/core.c:6813 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6828 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178 __down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306 inode_lock include/linux/fs.h:793 [inline] vfs_unlink+0xe4/0x600 fs/namei.c:4327 do_unlinkat+0x4ae/0x830 fs/namei.c:4402 __do_sys_unlinkat fs/namei.c:4445 [inline] __se_sys_unlinkat fs/namei.c:4438 [inline] __x64_sys_unlinkat+0xce/0xf0 fs/namei.c:4438 do_syscall_64+0xfd/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x40720e RSP: 002b:000000c000553638 EFLAGS: 00000202 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 000000000040720e RDX: 0000000000000000 RSI: 000000c000bed120 RDI: 000000000000001e RBP: 000000c000553678 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000112 R13: 000000c00046b400 R14: 000000c00019a1a0 R15: 000000c000c1c700 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by getty/4823: #0: ffff88802a4a40a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201 3 locks held by syz-fuzzer/5082: #0: ffff88802fc28420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409 #1: ffff88807b3c1800 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:828 [inline] #1: ffff88807b3c1800 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x26a/0x830 fs/namei.c:4389 #2: ffff88805dc1ca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline] #2: ffff88805dc1ca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xe4/0x600 fs/namei.c:4327 4 locks held by syz-executor.4/6578: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #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+0x241/0x360 lib/dump_stack.c:114 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xfb0/0xff0 kernel/hung_task.c:379 kthread+0x2f2/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4511 Comm: klogd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:PageTail include/linux/page-flags.h:286 [inline] RIP: 0010:folio_flags include/linux/page-flags.h:313 [inline] RIP: 0010:folio_test_slab include/linux/page-flags.h:481 [inline] RIP: 0010:virt_to_slab mm/kasan/../slab.h:206 [inline] RIP: 0010:qlink_to_cache+0x2a/0xb0 mm/kasan/quarantine.c:131 Code: e8 4b 95 49 ff 48 c1 e8 06 48 83 e0 c0 48 ba 00 00 00 00 00 ea ff ff 48 8b 4c 10 08 f6 c1 01 75 44 48 01 d0 66 90 48 8b 48 08 c1 01 75 65 66 90 48 8b 08 48 c1 e1 34 48 c1 f9 3f 48 21 c1 48 RSP: 0018:ffffc90003177680 EFLAGS: 00000286 RAX: ffffea000117da00 RBX: ffff888045f6a000 RCX: ffff888014c42140 RDX: ffffea0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888028a78500 R08: ffffffff8141ef1c R09: 1ffffffff259caa5 R10: dffffc0000000000 R11: fffffbfff259caa6 R12: 0000000000000000 R13: ffff888045f6a000 R14: ffffc900031776b8 R15: 0000000000000000 FS: 00007f6cfa8a9380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055fb6ae71b40 CR3: 000000002910c000 CR4: 0000000000350ef0 Call Trace: qlist_free_all+0x2e/0xc0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc_node+0x194/0x380 mm/slub.c:3888 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:658 alloc_skb include/linux/skbuff.h:1318 [inline] alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6504 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2795 unix_dgram_sendmsg+0x6d3/0x1f80 net/unix/af_unix.c:2019 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2199 do_syscall_64+0xfd/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f6cfaa0b9b5 Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83 RSP: 002b:00007fff22832ff8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f6cfaa0b9b5 RDX: 0000000000000049 RSI: 000055bb87eee310 RDI: 0000000000000003 RBP: 000055bb87ee8910 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013 R13: 00007f6cfab99212 R14: 00007fff228330f8 R15: 0000000000000000