INFO: task syz-executor158:5868 blocked for more than 143 seconds.
Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor158 state:D stack:28008 pid:5868 tgid:5868 ppid:5866 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:867 [inline]
blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877
vfs_fallocate+0x6a0/0x830 fs/open.c:341
ksys_fallocate fs/open.c:365 [inline]
__do_sys_fallocate fs/open.c:370 [inline]
__se_sys_fallocate fs/open.c:368 [inline]
__x64_sys_fallocate+0xc0/0x110 fs/open.c:368
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9775c82b29
RSP: 002b:00007ffe93cd6068 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9775c82b29
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000004
RBP: 00000000000f4240 R08: 00000000000000a0 R09: 00000000000000a0
R10: 0000002000000400 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe93cd6288 R14: 00007ffe93cd6090 R15: 00007ffe93cd6080
INFO: task syz-executor158:5869 blocked for more than 143 seconds.
Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor158 state:D stack:28008 pid:5869 tgid:5869 ppid:5867 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:867 [inline]
blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877
vfs_fallocate+0x6a0/0x830 fs/open.c:341
ksys_fallocate fs/open.c:365 [inline]
__do_sys_fallocate fs/open.c:370 [inline]
__se_sys_fallocate fs/open.c:368 [inline]
__x64_sys_fallocate+0xc0/0x110 fs/open.c:368
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9775c82b29
RSP: 002b:00007ffe93cd6068 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9775c82b29
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000004
RBP: 00000000000f4240 R08: 00000000000000a0 R09: 00000000000000a0
R10: 0000002000000400 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe93cd6288 R14: 00007ffe93cd6090 R15: 00007ffe93cd6080
INFO: task syz-executor158:5871 blocked for more than 143 seconds.
Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor158 state:D stack:27384 pid:5871 tgid:5871 ppid:5870 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:867 [inline]
blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877
vfs_fallocate+0x6a0/0x830 fs/open.c:341
ksys_fallocate fs/open.c:365 [inline]
__do_sys_fallocate fs/open.c:370 [inline]
__se_sys_fallocate fs/open.c:368 [inline]
__x64_sys_fallocate+0xc0/0x110 fs/open.c:368
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9775c82b29
RSP: 002b:00007ffe93cd6068 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9775c82b29
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000004
RBP: 00000000000f4240 R08: 00000000000000a0 R09: 00000000000000a0
R10: 0000002000000400 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe93cd6288 R14: 00007ffe93cd6090 R15: 00007ffe93cd6080
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13f140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13f140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13f140 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
1 lock held by klogd/5194:
2 locks held by getty/5596:
#0: ffff88814c5040a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by syz-executor158/5864:
1 lock held by syz-executor158/5868:
#0: ffff888022d14ca0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888022d14ca0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877
1 lock held by syz-executor158/5869:
#0: ffff888022d14ca0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888022d14ca0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877
1 lock held by syz-executor158/5871:
#0: ffff888022d14ca0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888022d14ca0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877
1 lock held by syz-executor158/5878:
#0: ffff888022d14ca0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888022d14ca0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5864 Comm: syz-executor158 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x11/0x90 kernel/kcov.c:288
Code: cc cc 0f 1f 80 00 00 00 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 14 25 08 10 9c 92 <65> 8b 0d d8 b0 db 10 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75
RSP: 0018:ffffc900043ff428 EFLAGS: 00000246
RAX: ffffffff84a3f2be RBX: ffff888024a7a800 RCX: 0000000000000000
RDX: ffff888033721e00 RSI: 0000000000000040 RDI: 0000000000000000
RBP: 0000000000000040 R08: ffff8880261d8097 R09: 1ffff11004c3b012
R10: dffffc0000000000 R11: ffffed1004c3b013 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffe8ffffd0fd00 R15: 0000000000000000
FS: 0000555593d85380(0000) GS:ffff888125d5f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555593d8e6f8 CR3: 000000002a248000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
blk_mq_put_tag+0x7e/0x120 block/blk-mq-tag.c:231
__blk_mq_free_request+0x2fb/0x430 block/blk-mq.c:782
nullb_complete_cmd drivers/block/null_blk/main.c:1402 [inline]
null_handle_cmd drivers/block/null_blk/main.c:1454 [inline]
null_queue_rq+0xbfe/0xe30 drivers/block/null_blk/main.c:1693
null_queue_rqs+0x123/0x270 drivers/block/null_blk/main.c:1707
__blk_mq_flush_list block/blk-mq.c:2826 [inline]
blk_mq_dispatch_queue_requests+0x414/0x800 block/blk-mq.c:2871
blk_mq_flush_plug_list+0x432/0x550 block/blk-mq.c:2959
blk_add_rq_to_plug+0x175/0x450 block/blk-mq.c:1388
blk_mq_submit_bio+0xbd3/0x22d0 block/blk-mq.c:3208
__submit_bio+0x207/0x5a0 block/blk-core.c:635
__submit_bio_noacct_mq block/blk-core.c:722 [inline]
submit_bio_noacct_nocheck+0x505/0xb50 block/blk-core.c:751
bio_chain_and_submit+0xeb/0x130 block/bio.c:362
__blkdev_issue_zero_pages+0x24f/0x2c0 block/blk-lib.c:222
blkdev_issue_zero_pages block/blk-lib.c:238 [inline]
blkdev_issue_zeroout+0x56c/0x7c0 block/blk-lib.c:325
blkdev_fallocate+0x3e6/0x4b0 block/fops.c:-1
vfs_fallocate+0x6a0/0x830 fs/open.c:341
ksys_fallocate fs/open.c:365 [inline]
__do_sys_fallocate fs/open.c:370 [inline]
__se_sys_fallocate fs/open.c:368 [inline]
__x64_sys_fallocate+0xc0/0x110 fs/open.c:368
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9775c82b29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe93cd6068 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9775c82b29
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000004
RBP: 00000000000f4240 R08: 00000000000000a0 R09: 00000000000000a0
R10: 0000002000000400 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe93cd6288 R14: 00007ffe93cd6090 R15: 00007ffe93cd6080
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.076 msecs