INFO: task syz-executor.0:8984 blocked for more than 143 seconds. Not tainted 6.4.0-rc1-syzkaller-00133-g9a48d6046722 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:24736 pid:8984 ppid:5020 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5343 [inline] __schedule+0x187b/0x4900 kernel/sched/core.c:6669 schedule+0xc3/0x180 kernel/sched/core.c:6745 io_schedule+0x8c/0x100 kernel/sched/core.c:8979 bit_wait_io+0x12/0xc0 kernel/sched/wait_bit.c:209 __wait_on_bit_lock+0xbd/0x1a0 kernel/sched/wait_bit.c:90 out_of_line_wait_on_bit_lock+0x1d4/0x250 kernel/sched/wait_bit.c:117 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer fs/buffer.c:70 [inline] lock_buffer include/linux/buffer_head.h:406 [inline] __sync_dirty_buffer+0x120/0x380 fs/buffer.c:2807 __ext4_handle_dirty_metadata+0x2a6/0x820 fs/ext4/ext4_jbd2.c:387 ext4_convert_inline_data_nolock+0xaba/0xd80 fs/ext4/inline.c:1252 ext4_convert_inline_data+0x4da/0x620 fs/ext4/inline.c:2063 ext4_page_mkwrite+0x288/0x1290 fs/ext4/inode.c:6044 do_page_mkwrite+0x1a4/0x600 mm/memory.c:2931 wp_page_shared mm/memory.c:3280 [inline] do_wp_page+0x501/0x3690 mm/memory.c:3362 handle_pte_fault mm/memory.c:4964 [inline] __handle_mm_fault mm/memory.c:5089 [inline] handle_mm_fault+0x2371/0x5860 mm/memory.c:5243 do_user_addr_fault arch/x86/mm/fault.c:1440 [inline] handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x7d2/0x910 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7fc6a4c86cc5 RSP: 002b:00007fffb156f6b8 EFLAGS: 00010206 RAX: 00000000200000c0 RBX: 0000000000000000 RCX: 00000000004e455a RDX: 0000000000000007 RSI: 000000005a4f5246 RDI: 00000000200000c0 RBP: 00007fffb156f778 R08: 00007fc6a4c00000 R09: 00007fc6a4800000 R10: 00007fc6a48009e0 R11: 000000000003ef6c R12: 000000000014464a R13: 00007fffb156f7a0 R14: 00007fffb156f7c0 R15: 0000000000000032 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8cf27670 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:518 1 lock held by rcu_tasks_trace/14: #0: ffffffff8cf27a30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:518 1 lock held by khungtaskd/28: #0: ffffffff8cf274a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/4744: #0: ffff88802d3a2098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900015b02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ab/0x1db0 drivers/tty/n_tty.c:2176 1 lock held by syz-executor.3/5039: #0: ffffffff8cf2cb78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline] #0: ffffffff8cf2cb78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a3/0x890 kernel/rcu/tree_exp.h:992 2 locks held by kworker/0:15/16741: #0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x77e/0x10e0 kernel/workqueue.c:2378 #1: ffffc9000c9efd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7c8/0x10e0 kernel/workqueue.c:2380 1 lock held by syz-executor.5/4909: #0: ffff8880463ac0e0 (&type->s_umount_key#53){++++}-{3:3}, at: deactivate_super+0xad/0xf0 fs/super.c:361 4 locks held by syz-executor.0/8984: #0: ffff88801246db68 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:161 [inline] #0: ffff88801246db68 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault arch/x86/mm/fault.c:1381 [inline] #0: ffff88801246db68 (&mm->mmap_lock){++++}-{3:3}, at: handle_page_fault arch/x86/mm/fault.c:1534 [inline] #0: ffff88801246db68 (&mm->mmap_lock){++++}-{3:3}, at: exc_page_fault+0x1b9/0x910 arch/x86/mm/fault.c:1590 #1: ffff888035eea558 (sb_pagefaults#2){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1494 [inline] #1: ffff888035eea558 (sb_pagefaults#2){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1598 [inline] #1: ffff888035eea558 (sb_pagefaults#2){.+.+}-{0:0}, at: ext4_page_mkwrite+0x244/0x1290 fs/ext4/inode.c:6039 #2: ffff8880786155a0 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:830 [inline] #2: ffff8880786155a0 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_page_mkwrite+0x27b/0x1290 fs/ext4/inode.c:6042 #3: ffff8880786150c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #3: ffff8880786150c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x3b6/0x620 fs/ext4/inline.c:2061 3 locks held by kworker/0:17/11835: #0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x77e/0x10e0 kernel/workqueue.c:2378 #1: ffffc90006d17d20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x7c8/0x10e0 kernel/workqueue.c:2380 #2: ffffffff8cf2cb78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline] #2: ffffffff8cf2cb78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x46c/0x890 kernel/rcu/tree_exp.h:992 3 locks held by syz-executor.0/12401: 1 lock held by syz-executor.1/12407: #0: ffff88808c9700e0 (&type->s_umount_key#64/1){+.+.}-{3:3}, at: alloc_super+0x217/0x930 fs/super.c:228 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.4.0-rc1-syzkaller-00133-g9a48d6046722 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x187/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xec2/0xf00 kernel/hung_task.c:379 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5160 Comm: kworker/u4:7 Not tainted 6.4.0-rc1-syzkaller-00133-g9a48d6046722 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Workqueue: phy6 ieee80211_iface_work RIP: 0010:memset+0x0/0x20 arch/x86/lib/memset_64.S:31 Code: 66 44 8b 1e 66 44 8b 54 16 fe 66 44 89 1f 66 44 89 54 17 fe eb 0c 48 83 fa 01 72 06 44 8a 1e 44 88 1f c3 48 89 d1 f3 a4 c3 90 0f 1e fa eb 1a 49 89 f9 40 88 f0 48 89 d1 f3 aa 4c 89 c8 c3 66 RSP: 0018:ffffc90005cf75c8 EFLAGS: 00000202 RAX: ffffc90005cf7b01 RBX: dffffc0000000000 RCX: ffffffff813cb7f1 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90005cf76f0 RBP: ffffc90005cf76d8 R08: dffffc0000000000 R09: fffff52000b9eee0 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff1e8bd50 R13: 1ffff92000b9eed5 R14: ffffffff8a2ab874 R15: ffffc90005cf76a0 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f88359fe000 CR3: 000000008bd69000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0xbf1/0x2200 arch/x86/kernel/unwind_orc.c:564 arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x117/0x1c0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3786 [inline] kmem_cache_free+0x297/0x520 mm/slub.c:3808 skb_kfree_head net/core/skbuff.c:903 [inline] skb_free_head net/core/skbuff.c:918 [inline] skb_release_data+0x637/0x850 net/core/skbuff.c:948 skb_release_all net/core/skbuff.c:1014 [inline] __kfree_skb net/core/skbuff.c:1028 [inline] kfree_skb_reason+0x193/0x380 net/core/skbuff.c:1064 kfree_skb include/linux/skbuff.h:1236 [inline] ieee80211_iface_work+0x264/0xd00 net/mac80211/iface.c:1650 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308