INFO: task syz.0.410:9054 blocked for more than 143 seconds.
Not tainted 6.15.0-rc2-syzkaller-00471-g119009db2674 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.410 state:D stack:27944 pid:9054 tgid:9025 ppid:5829 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
rwsem_down_write_slowpath+0xedd/0x1420 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1da/0x220 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:867 [inline]
f2fs_fallocate+0x26d/0xa10 fs/f2fs/file.c:1940
vfs_fallocate+0x627/0x7a0 fs/open.c:338
file_ioctl fs/ioctl.c:-1 [inline]
do_vfs_ioctl+0x2057/0x2750 fs/ioctl.c:885
__do_sys_ioctl fs/ioctl.c:904 [inline]
__se_sys_ioctl+0x80/0x160 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0d69b8e169
RSP: 002b:00007f0d6aa81038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0d69db6080 RCX: 00007f0d69b8e169
RDX: 0000200000000000 RSI: 0000000040305828 RDI: 0000000000000004
RBP: 00007f0d69c10a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f0d69db6080 R15: 00007ffdb49f7118
Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
1 lock held by khungtaskd/31:
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6764
2 locks held by kworker/u8:8/2981:
#0: ffff8880b8639998 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:605
#1: ffff8880b8623b08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41f/0x7a0 kernel/sched/psi.c:987
2 locks held by getty/5589:
#0: ffff88814d7250a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000334b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222
3 locks held by syz.9.403/8963:
5 locks held by syz.0.410/9026:
2 locks held by syz.0.410/9054:
#0: ffff888054c52420 (sb_writers#22){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline]
#0: ffff888054c52420 (sb_writers#22){.+.+}-{0:0}, at: vfs_fallocate+0x5a1/0x7a0 fs/open.c:337
#1: ffff8880574736e8 (&sb->s_type->i_mutex_key#29){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#1: ffff8880574736e8 (&sb->s_type->i_mutex_key#29){+.+.}-{4:4}, at: f2fs_fallocate+0x26d/0xa10 fs/f2fs/file.c:1940
1 lock held by syz-executor/10177:
3 locks held by syz.4.525/10205:
2 locks held by syz.4.525/10233:
#0: ffff888059962420 (sb_writers#22){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline]
#0: ffff888059962420 (sb_writers#22){.+.+}-{0:0}, at: vfs_fallocate+0x5a1/0x7a0 fs/open.c:337
#1: ffff88807bb51c18 (&sb->s_type->i_mutex_key#29){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#1: ffff88807bb51c18 (&sb->s_type->i_mutex_key#29){+.+.}-{4:4}, at: f2fs_fallocate+0x26d/0xa10 fs/f2fs/file.c:1940
2 locks held by syz.8.600/10986:
3 locks held by syz.5.598/10989:
1 lock held by syz.7.599/11001:
2 locks held by rm/11002:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc2-syzkaller-00471-g119009db2674 #0 PREEMPT(full)
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+0x4ab/0x4e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:437
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
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: 5191 Comm: klogd Not tainted 6.15.0-rc2-syzkaller-00471-g119009db2674 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:lock_release+0x8c/0x3e0 kernel/locking/lockdep.c:5879
Code: 71 c0 0e 00 0f 84 d4 01 00 00 65 8b 05 4d d4 c6 11 85 c0 0f 85 c5 01 00 00 65 4c 8b 2c 25 08 10 65 93 41 83 bd ec 0a 00 00 00 <0f> 85 ae 01 00 00 48 c7 c0 d0 96 28 94 49 39 07 0f 84 9e 01 00 00
RSP: 0018:ffffc90002fc7698 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff93651020 RCX: c17c53507b4d6300
RDX: 0000000000000000 RSI: ffffffff8ca0e160 RDI: ffffffff8ca0e120
RBP: ffffffff821c3563 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88805d81da00 R14: ffff888141ea58c0 R15: ffffffff8ee55680
FS: 00007f3cf91dd380(0000) GS:ffff888124fcf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f05086cb020 CR3: 0000000033b18000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
might_alloc include/linux/sched/mm.h:318 [inline]
slab_pre_alloc_hook mm/slub.c:4112 [inline]
slab_alloc_node mm/slub.c:4190 [inline]
kmem_cache_alloc_node_noprof+0x4e/0x3b0 mm/slub.c:4262
__alloc_skb+0x1c2/0x480 net/core/skbuff.c:658
alloc_skb include/linux/skbuff.h:1340 [inline]
alloc_skb_with_frags+0xc3/0x830 net/core/skbuff.c:6639
sock_alloc_send_pskb+0x91c/0xa70 net/core/sock.c:2954
unix_dgram_sendmsg+0x6d4/0x1ea0 net/unix/af_unix.c:2007
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:727
__sys_sendto+0x365/0x4c0 net/socket.c:2180
__do_sys_sendto net/socket.c:2187 [inline]
__se_sys_sendto net/socket.c:2183 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2183
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3cf933f9b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffc96548e78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f3cf933f9b5
RDX: 000000000000004a RSI: 000055d162bce3e0 RDI: 0000000000000003
RBP: 000055d162bc6910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007f3cf94cd212 R14: 00007ffc96548f78 R15: 0000000000000000