INFO: task syz.3.92:4162 blocked for more than 143 seconds. Not tainted 6.1.112-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.92 state:D stack:22584 pid:4162 ppid:3824 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5241 [inline] __schedule+0x143f/0x4570 kernel/sched/core.c:6558 schedule+0xbf/0x180 kernel/sched/core.c:6634 wait_on_state fs/btrfs/extent-io-tree.c:709 [inline] wait_extent_bit+0x423/0x570 fs/btrfs/extent-io-tree.c:742 lock_extent+0x17a/0x200 fs/btrfs/extent-io-tree.c:1657 btrfs_page_mkwrite+0x550/0xc90 fs/btrfs/inode.c:8610 do_page_mkwrite+0x1a1/0x5f0 mm/memory.c:3009 wp_page_shared+0x164/0x380 mm/memory.c:3358 handle_pte_fault mm/memory.c:5047 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x2525/0x5340 mm/memory.c:5292 do_user_addr_fault arch/x86/mm/fault.c:1340 [inline] handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x26f/0x620 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:copy_user_short_string+0xd/0x40 arch/x86/lib/copy_user_64.S:233 Code: 74 0a 89 d1 f3 a4 89 c8 0f 01 ca c3 89 d0 0f 01 ca c3 01 ca eb e7 0f 1f 80 00 00 00 00 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 <4c> 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a RSP: 0018:ffffc90003aef3b0 EFLAGS: 00050202 RAX: ffffffff8439cb01 RBX: 00007fffffffefc8 RCX: 0000000000000007 RDX: 0000000000000000 RSI: ffffc90003aef460 RDI: 00000000200004e0 RBP: ffffc90003aef510 R08: 0000000000000000 R09: fffff5200075de93 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000038 R13: ffffc90003aef460 R14: 00000000200004e0 R15: ffffc90003aef460 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] _copy_to_user+0xe9/0x130 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:169 [inline] fiemap_fill_next_extent+0x231/0x410 fs/ioctl.c:144 emit_fiemap_extent fs/btrfs/extent_io.c:3561 [inline] fiemap_process_hole+0x107e/0x1290 fs/btrfs/extent_io.c:3821 extent_fiemap+0xef7/0x1ff0 btrfs_fiemap+0x174/0x1e0 fs/btrfs/inode.c:8282 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x18e9/0x2a90 fs/ioctl.c:810 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x81/0x160 fs/ioctl.c:856 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: 0033:0x7f47a477dff9 RSP: 002b:00007f47a554a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f47a4935f80 RCX: 00007f47a477dff9 RDX: 00000000200004c0 RSI: 00000000c020660b RDI: 0000000000000004 RBP: 00007f47a47f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f47a4935f80 R15: 00007fffd0db05c8 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8d32b1d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffffffff8d32b9d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517 1 lock held by khungtaskd/28: #0: ffffffff8d32b000 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8d32b000 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8d32b000 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494 3 locks held by kworker/u4:4/56: #0: ffff8880b8e3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xa8/0x140 kernel/sched/core.c:545 #1: ffffc90001577d20 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267 #2: ffffffff8d32b000 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #2: ffffffff8d32b000 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #2: ffffffff8d32b000 (rcu_read_lock){....}-{1:2}, at: batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] #2: ffffffff8d32b000 (rcu_read_lock){....}-{1:2}, at: batadv_nc_worker+0xc7/0x610 net/batman-adv/network-coding.c:719 2 locks held by getty/3399: #0: ffff88814b337098 (&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:2198 4 locks held by syz.3.92/4162: #0: ffff8880702c05e0 (&sb->s_type->i_mutex_key#31){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] #0: ffff8880702c05e0 (&sb->s_type->i_mutex_key#31){++++}-{3:3}, at: btrfs_inode_lock+0x5c/0xd0 fs/btrfs/inode.c:147 #1: ffff8880737c53d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #1: ffff8880737c53d8 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline] #1: ffff8880737c53d8 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2e0 mm/memory.c:5382 #2: ffff88807b406558 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x1a1/0x5f0 mm/memory.c:3009 #3: ffff8880702c0468 (&ei->i_mmap_lock){++++}-{3:3}, at: btrfs_page_mkwrite+0x421/0xc90 fs/btrfs/inode.c:8599 1 lock held by syz.1.485/5932: #0: ffffffff8e4fa7e8 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x2a5/0x1b20 net/ipv4/devinet.c:1070 4 locks held by syz.1.485/5934: #0: ffffffff8e559870 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860 #1: ffffffff8e4fa7e8 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x5b/0x8a0 net/wireless/nl80211.c:16216 #2: ffff8880589207c8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5639 [inline] #2: ffff8880589207c8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_pre_doit+0x58b/0x8a0 net/wireless/nl80211.c:16289 #3: ffffffff8d3305f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline] #3: ffffffff8d3305f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x360/0x930 kernel/rcu/tree_exp.h:962 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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+0x1ae/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:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:unwind_next_frame+0x767/0x2220 Code: 84 c0 0f 84 45 04 00 00 89 d9 80 e1 07 38 c1 0f 8c 38 04 00 00 be 02 00 00 00 49 89 fe 48 89 df e8 5e 76 a5 00 e9 63 19 00 00 <48> 8b 44 24 60 80 3c 38 00 4c 8b 24 24 48 8b 5c 24 68 74 0e 49 89 RSP: 0018:ffffc900001b7480 EFLAGS: 00000097 RAX: 0000000000000003 RBX: 0000000000000005 RCX: ffffffff8ea9cf78 RDX: ffffffff8f163318 RSI: ffffffff81598e5b RDI: dffffc0000000000 RBP: ffffffff8f163318 R08: 0000000000000001 R09: ffffc900001b7650 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffffffff8f16331c R14: ffffffff8ea9cf74 R15: 1ffffffff1e2c663 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020024000 CR3: 0000000053de1000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x10d/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3d0 kernel/workqueue.c:1361 __queue_work+0xb4b/0xf90 kernel/workqueue.c:1520 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1544 [inline] __run_timers+0x6a8/0x890 kernel/time/timer.c:1820 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833 handle_softirqs+0x2ee/0xa40 kernel/softirq.c:571 run_ksoftirqd+0xc6/0x120 kernel/softirq.c:938 smpboot_thread_fn+0x52c/0xa30 kernel/smpboot.c:164 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295