INFO: task syz.4.277:8697 blocked for more than 143 seconds.
Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.277 state:D stack:13968 pid:8697 tgid:8694 ppid:7764 task_flags:0x440140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
__bch2_two_state_lock+0x229/0x2c0 fs/bcachefs/two_state_shared_lock.c:7
bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:55 [inline]
bch2_readahead+0x9e1/0x1240 fs/bcachefs/fs-io-buffered.c:272
read_pages+0x179/0x570 mm/readahead.c:160
page_cache_ra_order+0xa36/0xca0 mm/readahead.c:515
filemap_readahead mm/filemap.c:2559 [inline]
filemap_get_pages+0x9e4/0x1fb0 mm/filemap.c:2604
filemap_splice_read+0x68e/0xef0 mm/filemap.c:2980
do_splice_read fs/splice.c:985 [inline]
splice_direct_to_actor+0x4af/0xc80 fs/splice.c:1089
do_splice_direct_actor fs/splice.c:1207 [inline]
do_splice_direct+0x289/0x3e0 fs/splice.c:1233
do_sendfile+0x564/0x8a0 fs/read_write.c:1363
__do_sys_sendfile64 fs/read_write.c:1424 [inline]
__se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1410
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8bd78d169
RSP: 002b:00007ff8be68d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007ff8bd9a5fa0 RCX: 00007ff8bd78d169
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: 00007ff8bd80e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff8bd9a5fa0 R15: 00007ffd6c06d2d8
INFO: task syz.4.277:8767 blocked for more than 144 seconds.
Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.277 state:D stack:23536 pid:8767 tgid:8694 ppid:7764 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
io_schedule+0x8d/0x110 kernel/sched/core.c:7690
folio_wait_bit_common+0x839/0xee0 mm/filemap.c:1317
folio_lock include/linux/pagemap.h:1163 [inline]
truncate_inode_pages_range+0xc1f/0x10e0 mm/truncate.c:380
truncate_inode_pages mm/truncate.c:407 [inline]
truncate_pagecache mm/truncate.c:716 [inline]
truncate_setsize+0xcf/0xf0 mm/truncate.c:741
bchfs_truncate+0x6e0/0xc80 fs/bcachefs/fs-io.c:471
notify_change+0xbca/0xe90 fs/attr.c:552
do_truncate+0x220/0x310 fs/open.c:65
handle_truncate fs/namei.c:3451 [inline]
do_open fs/namei.c:3834 [inline]
path_openat+0x2e1b/0x3590 fs/namei.c:3989
do_filp_open+0x27f/0x4e0 fs/namei.c:4016
do_sys_openat2+0x13e/0x1d0 fs/open.c:1428
do_sys_open fs/open.c:1443 [inline]
__do_sys_open fs/open.c:1451 [inline]
__se_sys_open fs/open.c:1447 [inline]
__x64_sys_open+0x225/0x270 fs/open.c:1447
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8bd78d169
RSP: 002b:00007ff8be66c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ff8bd9a6080 RCX: 00007ff8bd78d169
RDX: 0000000000000002 RSI: 000000000014127e RDI: 00002000000003c0
RBP: 00007ff8bd80e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff8bd9a6080 R15: 00007ffd6c06d2d8
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
2 locks held by kworker/u8:1/13:
1 lock held by khungtaskd/31:
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
2 locks held by getty/5590:
#0: ffff8880325350a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900033332f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
1 lock held by udevd/5854:
1 lock held by syz.4.277/8697:
#0: ffff8880568d5670 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline]
#0: ffff8880568d5670 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: page_cache_ra_order+0x45d/0xca0 mm/readahead.c:491
2 locks held by syz.4.277/8767:
#0: ffff8880591de420 (sb_writers#17){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:547
#1: ffff8880568d54d0 (&sb->s_type->i_mutex_key#25){++++}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline]
#1: ffff8880568d54d0 (&sb->s_type->i_mutex_key#25){++++}-{4:4}, at: do_truncate+0x20c/0x310 fs/open.c:63
2 locks held by syz.3.591/11886:
#0: ffff88807a81e420 (sb_writers#29){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x220 fs/splice.c:1163
#1: ffff8880569652d0 (&sb->s_type->i_mutex_key#35){++++}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline]
#1: ffff8880569652d0 (&sb->s_type->i_mutex_key#35){++++}-{4:4}, at: btrfs_inode_lock+0x4d/0xe0 fs/btrfs/inode.c:362
10 locks held by syz.3.591/11928:
2 locks held by udevadm/11926:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
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:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11926 Comm: udevadm Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d f4 13 92 0c 48 89 de 5b e9 83 5e 59 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 00 d5 03 00 65 8b 15 80 f5 41 7e 81 e2 00 01 ff 00
RSP: 0018:ffffc90003ddf828 EFLAGS: 00000283
RAX: ffffffff8bfd4433 RBX: 0000000000000003 RCX: dffffc0000000000
RDX: ffff88802df09e00 RSI: 000000000000004f RDI: 0000000000000000
RBP: ffff8880302ca00b R08: ffffffff8bfd441e R09: ffffffff8bfd15ae
R10: 0000000000000008 R11: ffff88802df09e00 R12: ffff888051f56224
R13: ffff8880302ca008 R14: 00000000fffffffe R15: 000000000000004f
FS: 00007f4593bcbc80(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056436b0db950 CR3: 000000007d9ee000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
string_nocheck lib/vsprintf.c:636 [inline]
string+0x1e3/0x2b0 lib/vsprintf.c:714
vsnprintf+0x8b4/0x1220 lib/vsprintf.c:2843
vscnprintf+0x42/0x90 lib/vsprintf.c:2908
sysfs_emit_at+0x12a/0x1a0 fs/sysfs/file.c:794
uevent_show+0x29b/0x340 drivers/base/core.c:2739
dev_attr_show+0x55/0xc0 drivers/base/core.c:2424
sysfs_kf_seq_show+0x331/0x4c0 fs/sysfs/file.c:59
seq_read_iter+0x43f/0xd70 fs/seq_file.c:230
new_sync_read fs/read_write.c:484 [inline]
vfs_read+0x975/0xb40 fs/read_write.c:565
ksys_read+0x18f/0x2b0 fs/read_write.c:708
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4593716b6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd806e65f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000055bfdfab32a0 RCX: 00007f4593716b6a
RDX: 0000000000001000 RSI: 000055bfdfac6960 RDI: 0000000000000005
RBP: 000055bfdfab32a0 R08: 0000000000000005 R09: 0000000000000010
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007ffd806e6ad8 R15: 000000000000000a