INFO: task kworker/u4:6:1042 blocked for more than 143 seconds.
Not tainted 6.6.0-rc7-syzkaller-00041-g611da07b89fd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:6 state:D stack:20952 pid:1042 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-btrfs-37)
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x196c/0x4af0 kernel/sched/core.c:6695
schedule+0xc3/0x180 kernel/sched/core.c:6771
io_schedule+0x8c/0x100 kernel/sched/core.c:9026
folio_wait_bit_common+0x881/0x12a0 mm/filemap.c:1301
folio_lock include/linux/pagemap.h:1042 [inline]
extent_write_cache_pages fs/btrfs/extent_io.c:2078 [inline]
extent_writepages+0xc6e/0x2e50 fs/btrfs/extent_io.c:2226
do_writepages+0x3a6/0x670 mm/page-writeback.c:2553
__writeback_single_inode+0x155/0xfa0 fs/fs-writeback.c:1608
writeback_sb_inodes+0x8e3/0x1210 fs/fs-writeback.c:1899
__writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:1970
wb_writeback+0x461/0xc60 fs/fs-writeback.c:2077
wb_check_background_flush fs/fs-writeback.c:2147 [inline]
wb_do_writeback fs/fs-writeback.c:2235 [inline]
wb_workfn+0xc6f/0xff0 fs/fs-writeback.c:2262
process_one_work kernel/workqueue.c:2630 [inline]
process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703
worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
INFO: task syz-executor.4:7120 blocked for more than 144 seconds.
Not tainted 6.6.0-rc7-syzkaller-00041-g611da07b89fd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:25000 pid:7120 ppid:5076 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x196c/0x4af0 kernel/sched/core.c:6695
schedule+0xc3/0x180 kernel/sched/core.c:6771
wait_on_state fs/btrfs/extent-io-tree.c:719 [inline]
wait_extent_bit+0x50c/0x670 fs/btrfs/extent-io-tree.c:763
lock_extent+0x1c0/0x270 fs/btrfs/extent-io-tree.c:1755
btrfs_page_mkwrite+0x5bd/0xd10 fs/btrfs/inode.c:8143
do_page_mkwrite+0x197/0x470 mm/memory.c:2934
wp_page_shared mm/memory.c:3294 [inline]
do_wp_page+0xf87/0x4190 mm/memory.c:3379
handle_pte_fault mm/memory.c:4997 [inline]
__handle_mm_fault mm/memory.c:5122 [inline]
handle_mm_fault+0x1b45/0x62b0 mm/memory.c:5287
do_user_addr_fault arch/x86/mm/fault.c:1413 [inline]
handle_page_fault arch/x86/mm/fault.c:1505 [inline]
exc_page_fault+0x2ac/0x860 arch/x86/mm/fault.c:1561
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f20a2e5db98
RSP: 002b:00007fffce5d33b8 EFLAGS: 00010246
RAX: 0000000020000000 RBX: 00007fffce5d34c8 RCX: 0030656c69662f2e
RDX: 0000000000000008 RSI: 0030656c69662f2e RDI: 0000000020000000
RBP: 0000000000000032 R08: 00007f20a2e00000 R09: 000000000000004b
R10: 00000000813394ec R11: 000000000000c402 R12: 00007f20a2a060e8
R13: fffffffffffffffe R14: 00007f20a2a00000 R15: 00007f20a2a060f0
INFO: task syz-executor.4:7223 blocked for more than 145 seconds.
Not tainted 6.6.0-rc7-syzkaller-00041-g611da07b89fd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:24536 pid:7223 ppid:5076 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x196c/0x4af0 kernel/sched/core.c:6695
schedule+0xc3/0x180 kernel/sched/core.c:6771
io_schedule+0x8c/0x100 kernel/sched/core.c:9026
folio_wait_bit_common+0x881/0x12a0 mm/filemap.c:1301
btrfs_page_mkwrite+0x4a4/0xd10 fs/btrfs/inode.c:8133
do_page_mkwrite+0x197/0x470 mm/memory.c:2934
wp_page_shared mm/memory.c:3294 [inline]
do_wp_page+0xf87/0x4190 mm/memory.c:3379
handle_pte_fault mm/memory.c:4997 [inline]
__handle_mm_fault mm/memory.c:5122 [inline]
handle_mm_fault+0x1b45/0x62b0 mm/memory.c:5287
do_user_addr_fault arch/x86/mm/fault.c:1413 [inline]
handle_page_fault arch/x86/mm/fault.c:1505 [inline]
exc_page_fault+0x2ac/0x860 arch/x86/mm/fault.c:1561
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
RSP: 0018:ffffc900099c7550 EFLAGS: 00050206
RAX: 0000000000000000 RBX: 0000000020000118 RCX: 0000000000000038
RDX: 0000000000000000 RSI: ffffc900099c7600 RDI: 00000000200000e0
RBP: ffffc900099c76b0 R08: ffffc900099c7637 R09: 1ffff92001338ec6
R10: dffffc0000000000 R11: fffff52001338ec7 R12: 0000000000000038
R13: ffffc900099c7600 R14: 00000000200000e0 R15: ffffc900099c7600
copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline]
_copy_to_user+0x86/0xa0 lib/usercopy.c:41
copy_to_user include/linux/uaccess.h:191 [inline]
fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145
emit_last_fiemap_cache fs/btrfs/extent_io.c:2506 [inline]
extent_fiemap+0x1b9c/0x1fe0 fs/btrfs/extent_io.c:3033
btrfs_fiemap+0x178/0x1e0 fs/btrfs/inode.c:7815
ioctl_fiemap fs/ioctl.c:220 [inline]
do_vfs_ioctl+0x19ea/0x2b40 fs/ioctl.c:811
__do_sys_ioctl fs/ioctl.c:869 [inline]
__se_sys_ioctl+0x81/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f20a2e7cae9
RSP: 002b:00007f20a3b420c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f20a2f9c120 RCX: 00007f20a2e7cae9
RDX: 00000000200000c0 RSI: 00000000c020660b RDI: 0000000000000004
RBP: 00007f20a2ec847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f20a2f9c120 R15: 00007fffce5d32d8
Showing all locks held in the system:
2 locks held by kworker/0:1/9:
#0: ffff8880b983c318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558
#1: ffff8880b9828808 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:999
5 locks held by kworker/u4:1/12:
1 lock held by khungtaskd/29:
#0: ffffffff8d32c460 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
#0: ffffffff8d32c460 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:749 [inline]
#0: ffffffff8d32c460 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613
3 locks held by kworker/u4:6/1042:
#0: ffff888018a65138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
#0: ffff888018a65138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1400 kernel/workqueue.c:2703
#1: ffffc9000566fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
#1: ffffc9000566fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1400 kernel/workqueue.c:2703
#2: ffff8880329280e0 (&type->s_umount_key#54){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:607
4 locks held by kworker/u4:15/2895:
2 locks held by getty/4791:
#0: ffff88814b03d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900015b72f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2206
2 locks held by syz-executor.0/5065:
1 lock held by syz-executor.1/5071:
#0: ffffffff8d331df8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline]
#0: ffffffff8d331df8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a3/0x890 kernel/rcu/tree_exp.h:992
3 locks held by syz-executor.4/7120:
#0: ffff88801ff80b20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#0: ffff88801ff80b20 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5314 [inline]
#0: ffff88801ff80b20 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2d0 mm/memory.c:5374
#1: ffff888032928508 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x197/0x470 mm/memory.c:2934
#2: ffff888036aae138 (&ei->i_mmap_lock){++++}-{3:3}, at: btrfs_page_mkwrite+0x49c/0xd10 fs/btrfs/inode.c:8132
4 locks held by syz-executor.4/7223:
#0: ffff888036aae2b0 (&sb->s_type->i_mutex_key#22){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:812 [inline]
#0: ffff888036aae2b0 (&sb->s_type->i_mutex_key#22){++++}-{3:3}, at: btrfs_inode_lock+0x60/0xd0 fs/btrfs/inode.c:369
#1: ffff88801ff80b20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#1: ffff88801ff80b20 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5314 [inline]
#1: ffff88801ff80b20 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2d0 mm/memory.c:5374
#2: ffff888032928508 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x197/0x470 mm/memory.c:2934
#3: ffff888036aae138 (&ei->i_mmap_lock){++++}-{3:3}, at: btrfs_page_mkwrite+0x49c/0xd10 fs/btrfs/inode.c:8132
1 lock held by udevd/7364:
#0: ffff88801ad159c0 (mapping.invalidate_lock#2){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:857 [inline]
#0: ffff88801ad159c0 (mapping.invalidate_lock#2){.+.+}-{3:3}, at: page_cache_ra_unbounded+0xf1/0x7c0 mm/readahead.c:225
1 lock held by syz-executor.5/9405:
1 lock held by udevadm/9407:
4 locks held by syz-executor.3/9414:
1 lock held by syz-executor.0/9422:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.6.0-rc7-syzkaller-00041-g611da07b89fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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+0x198/0x310 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+0xfa9/0xff0 kernel/hung_task.c:379
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9433 Comm: syz-executor.2 Not tainted 6.6.0-rc7-syzkaller-00041-g611da07b89fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:io_serial_in+0x76/0xb0 drivers/tty/serial/8250/8250_port.c:417
Code: 50 4e c6 fc 89 e9 41 d3 e6 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 31 fd 20 fd 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d c3 89 e9 80 e1 07 38 c1 7c ad 48 89 ef
RSP: 0018:ffffc90017cbead8 EFLAGS: 00000002
RAX: 1ffffffff2440900 RBX: ffffffff92204dc0 RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff84c7cf06 R09: 1ffff1100398c046
R10: dffffc0000000000 R11: ffffed100398c047 R12: dffffc0000000000
R13: 00000000000026e4 R14: 00000000000003fd R15: dffffc0000000000
FS: 00007f43c13806c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f43b6e00fd2 CR3: 0000000078090000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:117 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:139 [inline]
wait_for_lsr drivers/tty/serial/8250/8250_port.c:2089 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3374 [inline]
serial8250_console_write+0x110e/0x1820 drivers/tty/serial/8250/8250_port.c:3452
console_emit_next_record kernel/printk/printk.c:2910 [inline]
console_flush_all+0x7ff/0xec0 kernel/printk/printk.c:2966
console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3035
vprintk_emit+0x508/0x720 kernel/printk/printk.c:2307
_printk+0xd5/0x120 kernel/printk/printk.c:2332
set_capacity_and_notify+0x21c/0x2b0 block/genhd.c:86
loop_set_size+0x44/0xa0 drivers/block/loop.c:237
loop_configure+0xd04/0x1250 drivers/block/loop.c:1100
lo_ioctl+0x8f5/0x2080
blkdev_ioctl+0x5cf/0x730 block/ioctl.c:630
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f43c067c84b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007f43c137fe40 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007f43c067c84b
RDX: 0000000000000005 RSI: 0000000000004c00 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000001cb
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00007f43c137ff3c R14: 00007f43c137ff40 R15: 00007f43b6dff000