INFO: task syz-executor.0:4593 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:24488 pid: 4593 ppid: 4495 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
wait_on_state fs/btrfs/extent_io.c:868 [inline]
wait_extent_bit+0x39b/0x4d0 fs/btrfs/extent_io.c:906
lock_extent_bits+0x82/0x110 fs/btrfs/extent_io.c:1469
btrfs_page_mkwrite+0x5b1/0xc50 fs/btrfs/inode.c:8976
do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922
wp_page_shared+0x16b/0x6d0 mm/memory.c:3259
handle_pte_fault mm/memory.c:4668 [inline]
__handle_mm_fault mm/memory.c:4785 [inline]
handle_mm_fault+0x1eca/0x43c0 mm/memory.c:4883
do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0010:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:92
Code: 38 4c 89 47 20 4c 89 4f 28 4c 89 57 30 4c 89 5f 38 48 8d 76 40 48 8d 7f 40 ff c9 75 b6 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:ffffc90002ebf6a0 EFLAGS: 00050202
RAX: ffffffff83dadb01 RBX: 0000000000000038 RCX: 0000000000000007
RDX: 0000000000000000 RSI: ffffc90002ebf740 RDI: 00000000200000e0
RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520005d7eef
R10: fffff520005d7eef R11: 1ffff920005d7ee8 R12: 00007ffffffff000
R13: 0000000020000118 R14: ffffc90002ebf740 R15: 00000000200000e0
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+0xf0/0x130 lib/usercopy.c:40
copy_to_user include/linux/uaccess.h:200 [inline]
fiemap_fill_next_extent+0x19d/0x360 fs/ioctl.c:144
emit_fiemap_extent fs/btrfs/extent_io.c:5460 [inline]
extent_fiemap+0x10ff/0x14f0 fs/btrfs/extent_io.c:5686
btrfs_fiemap+0xc0/0x110 fs/btrfs/inode.c:8599
ioctl_fiemap fs/ioctl.c:219 [inline]
do_vfs_ioctl+0x1464/0x1de0 fs/ioctl.c:814
__do_sys_ioctl fs/ioctl.c:872 [inline]
__se_sys_ioctl+0x83/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fab5c35c959
RSP: 002b:00007fab5b6de0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fab5c47bf80 RCX: 00007fab5c35c959
RDX: 00000000200000c0 RSI: 00000000c020660b RDI: 0000000000000004
RBP: 00007fab5c3b8c88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fab5c47bf80 R15: 00007ffff28651b8
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c11c660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3953:
#0: ffff88802be88098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900025e62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
3 locks held by syz-executor.0/4593:
#0: ffff88807ebfc728 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88807ebfc728 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2b9/0xc80 arch/x86/mm/fault.c:1298
#1: ffff88801fca8558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922
#2: ffff8880713f9838 (&ei->i_mmap_lock){.+.+}-{3:3}, at: btrfs_page_mkwrite+0x461/0xc50 fs/btrfs/inode.c:8965
2 locks held by syz-executor.0/6216:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe0f/0xe50 kernel/hung_task.c:369
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6217 Comm: udevadm Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:account_other_time+0x38/0x280 kernel/sched/cputime.c:260
Code: bd 00 00 00 00 00 fc ff df 48 c7 c0 84 c5 69 8d 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 b7 00 00 00 83 3d de b5 15 0c 00 74 1a <65> 8b 05 91 69 ae 7e 85 c0 75 0f 65 8b 05 b6 66 ae 7e 85 c0 0f 85
RSP: 0000:ffffc9000c48fe58 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 000000000000085d RCX: 0000000000000001
RDX: 1ffffffff1dda208 RSI: ffffffff8eed105c RDI: 000000000000085d
RBP: 000000000000085d R08: ffffffff8eed1048 R09: ffffffff8eed1058
R10: ffffffff8eed1050 R11: ffffffff8eed1043 R12: 1ffff11004bce85a
R13: dffffc0000000000 R14: ffff888025e73b80 R15: 000000000000085d
FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9eb739e000 CR3: 000000001b94b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
get_vtime_delta kernel/sched/cputime.c:662 [inline]
vtime_user_exit+0xfa/0x400 kernel/sched/cputime.c:726
__context_tracking_exit+0x4c/0x80 kernel/context_tracking.c:160
user_exit_irqoff include/linux/context_tracking.h:47 [inline]
__enter_from_user_mode kernel/entry/common.c:22 [inline]
irqentry_enter_from_user_mode+0x22/0x40 kernel/entry/common.c:314
irqentry_enter+0xf/0x50 kernel/entry/common.c:332
exc_page_fault+0x42/0x100 arch/x86/mm/fault.c:1498
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f9eb73c1e3b
Code: 74 0a 0f b7 74 16 fe 66 89 74 17 fe 88 0f c3 8b 4c 16 fc 8b 36 89 4c 17 fc 89 37 c3 0f 1f 00 48 8b 4c 16 f8 48 8b 36 48 89 37 <48> 89 4c 17 f8 c3 0f 10 54 16 f0 0f 10 5c 16 e0 0f 11 07 0f 11 4f
RSP: 002b:00007ffc39799c48 EFLAGS: 00010206
RAX: 00007f9eb739dff8 RBX: 0000000000000000 RCX: 00322e6f732e646f
RDX: 000000000000000d RSI: 2e646f6d6b62696c RDI: 00007f9eb739dff8
RBP: 00007f9eb739db00 R08: 00007f9eb739dfd8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c
R13: 0000000000000000 R14: 00007f9eb739db20 R15: 00007f9eb73d5310