INFO: task syz.6.740:9719 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.740 state:D stack:25304 pid:9719 tgid:9718 ppid:7471 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5290 [inline]
__schedule+0x14db/0x5030 kernel/sched/core.c:6902
__schedule_loop kernel/sched/core.c:6984 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6999
io_schedule+0x80/0xd0 kernel/sched/core.c:7828
folio_wait_bit_common+0x6b0/0xb80 mm/filemap.c:1323
__folio_lock mm/filemap.c:1699 [inline]
folio_lock include/linux/pagemap.h:1170 [inline]
__filemap_get_folio_mpol+0x13e/0xb00 mm/filemap.c:1954
__filemap_get_folio include/linux/pagemap.h:774 [inline]
filemap_grab_folio include/linux/pagemap.h:854 [inline]
__get_metapage+0x290/0xde0 fs/jfs/jfs_metapage.c:722
dtSplitRoot+0x202/0x16c0 fs/jfs/jfs_dtree.c:1910
dtSplitUp fs/jfs/jfs_dtree.c:993 [inline]
dtInsert+0xef8/0x5f40 fs/jfs/jfs_dtree.c:871
jfs_create+0x6c8/0xa80 fs/jfs/namei.c:138
lookup_open fs/namei.c:4481 [inline]
open_last_lookups fs/namei.c:4581 [inline]
path_openat+0x1387/0x3840 fs/namei.c:4825
do_file_open+0x203/0x440 fs/namei.c:4857
do_sys_openat2+0x105/0x1e0 fs/open.c:1366
do_sys_open fs/open.c:1372 [inline]
__do_sys_openat fs/open.c:1388 [inline]
__se_sys_openat fs/open.c:1383 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1383
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb1a5d8f749
RSP: 002b:00007fb1a6cb4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fb1a5fe5fa0 RCX: 00007fb1a5d8f749
RDX: 000000000000275a RSI: 0000200000000180 RDI: ffffffffffffff9c
RBP: 00007fb1a5e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb1a5fe6038 R14: 00007fb1a5fe5fa0 R15: 00007ffd30eadef8
INFO: task syz.6.740:9723 blocked for more than 145 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.740 state:D stack:25704 pid:9723 tgid:9718 ppid:7471 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5290 [inline]
__schedule+0x14db/0x5030 kernel/sched/core.c:6902
__schedule_loop kernel/sched/core.c:6984 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6999
io_schedule+0x80/0xd0 kernel/sched/core.c:7828
folio_wait_bit_common+0x6b0/0xb80 mm/filemap.c:1323
folio_lock include/linux/pagemap.h:1170 [inline]
release_metapage+0x103/0xac0 fs/jfs/jfs_metapage.c:870
discard_metapage fs/jfs/jfs_metapage.h:88 [inline]
__get_metapage+0x9a3/0xde0 fs/jfs/jfs_metapage.c:753
ea_read+0x2dd/0x660 fs/jfs/xattr.c:396
ea_get+0x478/0x1330 fs/jfs/xattr.c:498
__jfs_setxattr+0xee/0x1120 fs/jfs/xattr.c:680
__jfs_xattr_set+0xda/0x170 fs/jfs/xattr.c:941
__vfs_setxattr+0x43c/0x480 fs/xattr.c:200
__vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
vfs_setxattr+0x162/0x360 fs/xattr.c:321
do_setxattr fs/xattr.c:636 [inline]
filename_setxattr+0x286/0x610 fs/xattr.c:664
path_setxattrat+0x364/0x3a0 fs/xattr.c:708
__do_sys_setxattr fs/xattr.c:742 [inline]
__se_sys_setxattr fs/xattr.c:738 [inline]
__x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb1a5d8f749
RSP: 002b:00007fb1a6c93038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007fb1a5fe6090 RCX: 00007fb1a5d8f749
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 00002000000000c0
RBP: 00007fb1a5e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb1a5fe6128 R14: 00007fb1a5fe6090 R15: 00007ffd30eadef8
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e144ce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e144ce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e144ce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:4/59:
#0: ffff888141ef0948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x841/0x15a0 kernel/workqueue.c:3254
#1: ffffc9000210fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15a0 kernel/workqueue.c:3255
#2: ffff88807f11a0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:563
2 locks held by getty/5581:
#0: ffff8880335c50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460 drivers/tty/n_tty.c:2211
3 locks held by syz-executor/5824:
4 locks held by syz.6.740/9719:
#0: ffff88807f11a420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:504
#1: ffff88806a49f358 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#1: ffff88806a49f358 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: open_last_lookups fs/namei.c:4578 [inline]
#1: ffff88806a49f358 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: path_openat+0xb4c/0x3840 fs/namei.c:4825
#2: ffff88806a49efa8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_create+0x1f5/0xa80 fs/jfs/namei.c:101
#3: ffff88806a4981c8 (&jfs_ip->commit_mutex/1){+.+.}-{4:4}, at: jfs_create+0x210/0xa80 fs/jfs/namei.c:102
4 locks held by syz.6.740/9723:
#0: ffff88807f11a420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:504
#1: ffff88806a49ea30 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#1: ffff88806a49ea30 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: vfs_setxattr+0x13d/0x360 fs/xattr.c:320
#2: ffff88806a49e680 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: __jfs_xattr_set+0xb9/0x170 fs/jfs/xattr.c:940
#3: ffff88806a49e718 (&jfs_ip->xattr_sem){++++}-{4:4}, at: __jfs_setxattr+0xe1/0x1120 fs/jfs/xattr.c:678
1 lock held by cmp/12110:
#0: ffff8880b863abe0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xba/0x150 kernel/sched/core.c:655
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xf95/0xfe0 kernel/hung_task.c:515
kthread+0x389/0x480 kernel/kthread.c:467
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 12111 Comm: rm Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__slab_free+0xb0/0x320 mm/slub.c:6155
Code: 4c 24 30 48 89 4c 24 40 4c 89 74 24 48 89 44 24 48 4d 85 ed 74 45 45 85 f6 0f 88 d9 00 00 00 41 bc 00 00 00 00 83 7c 24 08 00 <75> 32 48 8b 03 48 c1 e8 3a 4d 8b a4 c7 e8 00 00 00 4c 89 e7 e8 37
RSP: 0018:ffffc9000bbff9d0 EFLAGS: 00000202
RAX: 000000000010000b RBX: ffffea0001013dc0 RCX: ffff8880404f7400
RDX: ffff8880404f7400 RSI: ffffea0001013dc0 RDI: 0000000000000000
RBP: ffffc9000bbffa68 R08: 0000000000000000 R09: ffffffff8228022c
R10: dffffc0000000000 R11: fffffbfff1f45b3f R12: 0000000000000000
R13: ffff8880404f7300 R14: 000000000010000c R15: ffff88801bec5640
FS: 00007f9b563f5c80(0000) GS:ffff888125bf9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005589a7aff008 CR3: 0000000030930000 CR4: 00000000003526f0
Call Trace:
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:5187 [inline]
slab_alloc_node mm/slub.c:5500 [inline]
__do_kmalloc_node mm/slub.c:5893 [inline]
__kvmalloc_node_noprof+0x57f/0x920 mm/slub.c:7467
seq_buf_alloc fs/seq_file.c:39 [inline]
seq_read_iter+0x202/0xe20 fs/seq_file.c:211
proc_reg_read_iter+0x1b7/0x280 fs/proc/inode.c:299
new_sync_read fs/read_write.c:493 [inline]
vfs_read+0x55a/0xa30 fs/read_write.c:574
ksys_read+0x145/0x250 fs/read_write.c:717
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9b56545407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffd3e02bee0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f9b563f5c80 RCX: 00007f9b56545407
RDX: 0000000000000400 RSI: 00005589a7aff500 RDI: 0000000000000003
RBP: 00007f9b5668dff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd3e02bfc8
R13: 00007f9b5668dea0 R14: 00007f9b564914d0 R15: 0000000000000000