INFO: task syz.3.627:9007 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.3.627 state:D stack:28728 pid:9007 tgid:9004 ppid:5843 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776
blk_trace_remove kernel/trace/blktrace.c:562 [inline]
blk_trace_ioctl+0x314/0x6e0 kernel/trace/blktrace.c:950
blkdev_common_ioctl+0x11ad/0x2c70 block/ioctl.c:712
blkdev_ioctl+0x553/0x710 block/ioctl.c:786
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
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: 0033:0x7f047af8f749
RSP: 002b:00007f047bde9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f047b1e6180 RCX: 00007f047af8f749
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000003
RBP: 00007f047b013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f047b1e6218 R14: 00007f047b1e6180 R15: 00007f047b30fa28
INFO: task syz.0.653:9113 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.0.653 state:D stack:26440 pid:9113 tgid:9110 ppid:5842 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776
blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788
blk_trace_ioctl+0x2f9/0x6e0 kernel/trace/blktrace.c:935
blkdev_ioctl+0x4a2/0x710 block/ioctl.c:781
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
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: 0033:0x7f1e7d58f749
RSP: 002b:00007f1e7e415038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1e7d7e6090 RCX: 00007f1e7d58f749
RDX: 0000200000000000 RSI: 00000000c0481273 RDI: 0000000000000007
RBP: 00007f1e7d613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1e7d7e6128 R14: 00007f1e7d7e6090 R15: 00007f1e7d90fa28
INFO: task syz.0.653:9116 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.0.653 state:D stack:28728 pid:9116 tgid:9110 ppid:5842 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776
blk_trace_remove kernel/trace/blktrace.c:562 [inline]
blk_trace_ioctl+0x314/0x6e0 kernel/trace/blktrace.c:950
blkdev_common_ioctl+0x11ad/0x2c70 block/ioctl.c:712
blkdev_ioctl+0x553/0x710 block/ioctl.c:786
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
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: 0033:0x7f1e7d58f749
RSP: 002b:00007f1e7e3f4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1e7d7e6180 RCX: 00007f1e7d58f749
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000007
RBP: 00007f1e7d613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1e7d7e6218 R14: 00007f1e7d7e6180 R15: 00007f1e7d90fa28
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df41aa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df41aa0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8df41aa0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by klogd/5192:
2 locks held by udevd/5203:
#0: ffff88807d35d900 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:410 [inline]
#0: ffff88807d35d900 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:390 [inline]
#0: ffff88807d35d900 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300 mm/mmap_lock.c:450
#1: ffffffff8e04f960 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4374 [inline]
#1: ffffffff8e04f960 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xb8/0x300 mm/page_alloc.c:4399
2 locks held by getty/5596:
#0: ffff88814e1040a0 (&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+0x449/0x1460 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/5821:
2 locks held by syz-executor/5847:
2 locks held by syz-executor/5848:
2 locks held by udevd/5881:
2 locks held by syz.3.627/9005:
1 lock held by syz.3.627/9007:
#0: ffff888141fc4b98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:562 [inline]
#0: ffff888141fc4b98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x314/0x6e0 kernel/trace/blktrace.c:950
1 lock held by syz.0.653/9113:
#0: ffff888141fc4b98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788
1 lock held by syz.0.653/9116:
#0: ffff888141fc4b98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:562 [inline]
#0: ffff888141fc4b98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x314/0x6e0 kernel/trace/blktrace.c:950
2 locks held by syz-executor/9143:
8 locks held by syz-executor/9236:
1 lock held by syz.5.801/9724:
#0: ffff888141fc4b98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788
1 lock held by syz.5.801/9725:
#0: ffff888141fc4b98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:562 [inline]
#0: ffff888141fc4b98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x314/0x6e0 kernel/trace/blktrace.c:950
1 lock held by syz.8.834/9937:
#0: ffff888141fc4b98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788
1 lock held by syz-executor/10065:
#0: ffff888076e8f1c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1a7/0x4a0 mm/mmap_lock.c:259
1 lock held by syz.6.929/10240:
#0: ffff8880115c48e0 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff8880115c48e0 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0x8ff/0x1290 mm/filemap.c:3556
2 locks held by syz-executor/10242:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 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:160 [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+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9236 Comm: syz-executor 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:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:400
Code: e8 de db a6 fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 ef fb 0c fd 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 0a 64 42 06 cc 44 89 f9 80 e1 07
RSP: 0000:ffffc900048b6c18 EFLAGS: 00000006
RAX: 1ffffffff3381405 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc900048b6db0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff851a1b90 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff99c0a2c0 R15: 0000000000000000
FS: 000055556c8b4500(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe355fd96a0 CR3: 000000014ffa4000 CR4: 00000000003526f0
Call Trace:
serial_port_in include/linux/serial_core.h:806 [inline]
serial8250_console_write+0x542/0x1b60 drivers/tty/serial/8250/8250_port.c:3306
console_emit_next_record kernel/printk/printk.c:3129 [inline]
console_flush_one_record kernel/printk/printk.c:3215 [inline]
console_flush_all+0x713/0xb00 kernel/printk/printk.c:3289
__console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
console_unlock+0xbb/0x190 kernel/printk/printk.c:3359
vprintk_emit+0x47b/0x550 kernel/printk/printk.c:2426
_printk+0xcf/0x120 kernel/printk/printk.c:2451
dump_unreclaimable_slab+0x112/0x150 mm/slab_common.c:1164
dump_header+0x3b9/0x4c0 mm/oom_kill.c:473
oom_kill_process+0x263/0x800 mm/oom_kill.c:1047
out_of_memory+0xfe4/0x12b0 mm/oom_kill.c:1167
__alloc_pages_may_oom+0x1f2/0x330 mm/page_alloc.c:4092
__alloc_pages_slowpath+0x713/0xce0 mm/page_alloc.c:4897
__alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:5223
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2505
__read_swap_cache_async+0x101/0x480 mm/swap_state.c:440
swap_cluster_readahead+0x500/0x630 mm/swap_state.c:665
swapin_readahead+0x189/0xc60 mm/swap_state.c:821
do_swap_page+0x837/0x5c70 mm/memory.c:4753
handle_pte_fault mm/memory.c:6276 [inline]
__handle_mm_fault mm/memory.c:6411 [inline]
handle_mm_fault+0x1277/0x32b0 mm/memory.c:6580
do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f85cdf444ff
Code: Unable to access opcode bytes at 0x7f85cdf444d5.
RSP: 002b:00007f85ce30ea48 EFLAGS: 00010286
RAX: 00007f85ce30ea60 RBX: 00007f85ce30ed70 RCX: 0000000000000000
RDX: 00000000ffffffff RSI: 00000000fbad8000 RDI: 00007f85ce30ea60
RBP: 00007f85ce30eb50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000293 R12: 00007f85ce013d9c
R13: 00007f85ce30ebe0 R14: 0000000000000000 R15: 00007f85ce30ea60