INFO: task syz.2.89:6225 blocked for more than 143 seconds.
Not tainted 6.14.0-syzkaller-00685-g3ba7dfb8da62 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.89 state:D stack:27552 pid:6225 tgid:6210 ppid:5824 task_flags:0x400040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5373 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6760
__schedule_loop kernel/sched/core.c:6837 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6852
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6909
__mutex_lock_common kernel/locking/mutex.c:662 [inline]
__mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
blk_trace_startstop+0xa4/0x740 kernel/trace/blktrace.c:700
sg_ioctl_common drivers/scsi/sg.c:1120 [inline]
sg_ioctl+0xba2/0x2e10 drivers/scsi/sg.c:1156
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
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: 0033:0x7f64ca98d169
RSP: 002b:00007f64cb866038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f64caba6240 RCX: 00007f64ca98d169
RDX: 0000000000000000 RSI: 0000000000001275 RDI: 0000000000000004
RBP: 00007f64caa0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f64caba6240 R15: 00007ffdbfa22e48
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8eb39420 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8eb39420 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8eb39420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
3 locks held by kworker/u8:4/62:
#0: ffff888032150948 ((wq_completion)l2tp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff888032150948 ((wq_completion)l2tp){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319
#1: ffffc9000153fc60 ((work_completion)(&session->del_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc9000153fc60 ((work_completion)(&session->del_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319
#2: ffffffff8eb3e800 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:3774
2 locks held by kswapd0/90:
2 locks held by getty/5575:
#0: ffff8880317ce0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000331b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
3 locks held by syz.2.89/6216:
1 lock held by syz.2.89/6225:
#0: ffff888025c3e468 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_startstop+0xa4/0x740 kernel/trace/blktrace.c:700
3 locks held by kworker/u8:9/6541:
2 locks held by syz.0.244/6762:
#0: ffff88802575ad48 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631
#1: ffffffff8eb8bf28 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3cb/0x950 kernel/relay.c:515
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-00685-g3ba7dfb8da62 #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: 90 Comm: kswapd0 Not tainted 6.14.0-syzkaller-00685-g3ba7dfb8da62 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__asan_memset+0x7/0x50 mm/kasan/shadow.c:83
Code: 00 00 e9 bc e6 ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 56 <53> 48 89 d3 41 89 f6 48 89 fd 48 8b 4c 24 18 48 89 d6 ba 01 00 00
RSP: 0018:ffffc900026de820 EFLAGS: 00000246
RAX: ffffffff84f5cb6b RBX: ffff888035e2d698 RCX: ffff88801d70bc00
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff888035e2d5a8
RBP: 0000000000000000 R08: ffff888035e2c72f R09: 0000000000000000
R10: ffff888035e2c720 R11: ffffed1006bc58e6 R12: ffff888035e2d5a8
R13: ffff888035e20000 R14: 00000000000000a8 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4059f78ab8 CR3: 000000002a30a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
INIT_HLIST_NODE include/linux/list.h:937 [inline]
hlist_del_init include/linux/list.h:1009 [inline]
hash_del include/linux/hashtable.h:107 [inline]
update_hashtables lib/842/842_compress.c:433 [inline]
sw842_compress+0x28ba/0x4880 lib/842/842_compress.c:550
scomp_acomp_comp_decomp+0x4ac/0x7c0
crypto_acomp_compress include/crypto/acompress.h:251 [inline]
zswap_compress mm/zswap.c:962 [inline]
zswap_store_page mm/zswap.c:1462 [inline]
zswap_store+0xcfe/0x1c20 mm/zswap.c:1571
swap_writepage+0x647/0xce0 mm/page_io.c:278
pageout mm/vmscan.c:696 [inline]
shrink_folio_list+0x376a/0x5930 mm/vmscan.c:1402
shrink_inactive_list mm/vmscan.c:2000 [inline]
shrink_list mm/vmscan.c:2238 [inline]
shrink_lruvec+0x16db/0x2f30 mm/vmscan.c:5749
shrink_node_memcgs mm/vmscan.c:5951 [inline]
shrink_node+0x12a4/0x2e10 mm/vmscan.c:5992
kswapd_shrink_node mm/vmscan.c:6807 [inline]
balance_pgdat mm/vmscan.c:6999 [inline]
kswapd+0x1958/0x2e30 mm/vmscan.c:7264
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