INFO: task kworker/u8:21:22715 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:21 state:D stack:21544 pid:22715 tgid:22715 ppid:2 task_flags:0x4388060 flags:0x00080000
Workqueue: loop9 loop_workfn
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383
rwsem_down_read_slowpath+0x6ba/0x920 kernel/locking/rwsem.c:1114
__down_read_common kernel/locking/rwsem.c:1291 [inline]
__down_read kernel/locking/rwsem.c:1304 [inline]
down_read+0x9c/0x330 kernel/locking/rwsem.c:1576
inode_lock_shared include/linux/fs.h:1039 [inline]
blkdev_read_iter+0x2df/0x420 block/fops.c:829
lo_rw_aio+0xc72/0xf20 include/linux/percpu-rwsem.h:-1
do_req_filebacked drivers/block/loop.c:431 [inline]
loop_handle_cmd drivers/block/loop.c:1921 [inline]
loop_process_work+0x95e/0x11c0 drivers/block/loop.c:1956
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task udevd:27635 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:25512 pid:27635 tgid:27635 ppid:4994 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821
bdev_open+0xde/0xd70 block/bdev.c:948
blkdev_open+0x461/0x600 block/fops.c:672
do_dentry_open+0x816/0x1380 fs/open.c:947
vfs_open+0x3b/0x340 fs/open.c:1052
do_open fs/namei.c:4700 [inline]
path_openat+0x2e44/0x3830 fs/namei.c:4863
do_file_open+0x23e/0x4a0 fs/namei.c:4892
do_sys_openat2+0x115/0x200 fs/open.c:1368
do_sys_open fs/open.c:1374 [inline]
__do_sys_openat fs/open.c:1390 [inline]
__se_sys_openat fs/open.c:1385 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1385
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9de6ca7407
RSP: 002b:00007ffdc2dc9d10 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9de73ec880 RCX: 00007f9de6ca7407
RDX: 0000000000080000 RSI: 00005635681f3c70 RDI: ffffffffffffff9c
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000056356709195f
R13: 00005635670a2660 R14: 0000000000000000 R15: 00000000ffffffff
INFO: task syz.5.5564:27887 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.5.5564 state:D stack:25640 pid:27887 tgid:27887 ppid:17967 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383
rwsem_down_read_slowpath+0x6ba/0x920 kernel/locking/rwsem.c:1114
__down_read_common kernel/locking/rwsem.c:1291 [inline]
__down_read kernel/locking/rwsem.c:1304 [inline]
down_read+0x9c/0x330 kernel/locking/rwsem.c:1576
filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
page_cache_ra_order+0x3eb/0xee0 mm/readahead.c:517
do_sync_mmap_readahead+0x75e/0x990 mm/filemap.c:3428
filemap_fault+0x7d9/0x13b0 mm/filemap.c:3582
__do_fault+0x138/0x2a0 mm/memory.c:5425
do_shared_fault mm/memory.c:5924 [inline]
do_fault mm/memory.c:5998 [inline]
do_pte_missing+0x684/0x34b0 mm/memory.c:4566
handle_pte_fault mm/memory.c:6379 [inline]
__handle_mm_fault mm/memory.c:6517 [inline]
handle_mm_fault+0x1b36/0x3080 mm/memory.c:6686
do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7fe0ac86b378
RSP: 002b:00007fe0acd4fbb0 EFLAGS: 00010246
RAX: 0000200000000140 RBX: 0000000000000002 RCX: 000000000000002a
RDX: c34189b6038082ad RSI: 0000000000000000 RDI: 0000555582c143d8
RBP: fffffffffffffffe R08: 0000001b2ea20000 R09: 000000000000000f
R10: 00001fffffffffff R11: 0000000000000006 R12: 00007fe0acd4fcd0
R13: 00007fe0acc2609c R14: 00000000001adf6b R15: 00007fe0acc26090
INFO: task syz.5.5564:27888 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.5564 state:D stack:25768 pid:27888 tgid:27887 ppid:17967 task_flags:0x440140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383
rwsem_down_read_slowpath+0x6ba/0x920 kernel/locking/rwsem.c:1114
__down_read_common kernel/locking/rwsem.c:1291 [inline]
__down_read kernel/locking/rwsem.c:1304 [inline]
down_read+0x9c/0x330 kernel/locking/rwsem.c:1576
filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
page_cache_ra_order+0x3eb/0xee0 mm/readahead.c:517
do_sync_mmap_readahead+0x75e/0x990 mm/filemap.c:3428
filemap_fault+0x7d9/0x13b0 mm/filemap.c:3582
__do_fault+0x138/0x2a0 mm/memory.c:5425
do_shared_fault mm/memory.c:5924 [inline]
do_fault mm/memory.c:5998 [inline]
do_pte_missing+0x684/0x34b0 mm/memory.c:4566
handle_pte_fault mm/memory.c:6379 [inline]
__handle_mm_fault mm/memory.c:6517 [inline]
handle_mm_fault+0x1b36/0x3080 mm/memory.c:6686
faultin_page mm/gup.c:1126 [inline]
__get_user_pages+0x1678/0x2720 mm/gup.c:1428
__get_user_pages_locked mm/gup.c:1692 [inline]
faultin_page_range+0x26a/0x8f0 mm/gup.c:1912
madvise_populate mm/madvise.c:968 [inline]
madvise_do_behavior+0x2e4/0x540 mm/madvise.c:1905
do_madvise+0x327/0x3a0 mm/madvise.c:2005
__do_sys_madvise mm/madvise.c:2014 [inline]
__se_sys_madvise mm/madvise.c:2012 [inline]
__x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2012
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe0ac99de99
RSP: 002b:00007fe0ad903028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007fe0acc25fa0 RCX: 00007fe0ac99de99
RDX: 0000000000000017 RSI: 0000000000c00000 RDI: 0000200000000000
RBP: 00007fe0aca33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe0acc26038 R14: 00007fe0acc25fa0 R15: 00007fe0acd4fa48
INFO: task syz.4.5603:28052 blocked in I/O wait for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5603 state:D stack:24520 pid:28052 tgid:28047 ppid:18131 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
io_schedule+0x7f/0xd0 kernel/sched/core.c:8154
folio_wait_bit_common+0x836/0xbc0 mm/filemap.c:1323
folio_put_wait_locked mm/filemap.c:1492 [inline]
do_read_cache_folio+0x1ac/0x590 mm/filemap.c:4122
read_mapping_folio include/linux/pagemap.h:1015 [inline]
read_part_sector+0xb6/0x2b0 block/partitions/core.c:724
adfspart_check_POWERTEC+0x9a/0x7a0 block/partitions/acorn.c:451
check_partition block/partitions/core.c:143 [inline]
blk_add_partitions block/partitions/core.c:591 [inline]
bdev_disk_changed+0x851/0x17a0 block/partitions/core.c:695
loop_reread_partitions+0x5f/0xf0 drivers/block/loop.c:443
loop_configure+0xb4e/0xdc0 drivers/block/loop.c:1092
lo_ioctl+0xa9a/0x1fc0 drivers/block/loop.c:1538
blkdev_ioctl+0x5e3/0x740 block/ioctl.c:797
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+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f13c019de99
RSP: 002b:00007f13c10fd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f13c0426090 RCX: 00007f13c019de99
RDX: 0000200000000440 RSI: 0000000000004c0a RDI: 000000000000000f
RBP: 00007f13c0233eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f13c0426128 R14: 00007f13c0426090 R15: 00007f13c054fa48
INFO: task syz.4.5603:28053 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.4.5603 state:D stack:26152 pid:28053 tgid:28047 ppid:18131 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821
loop_reread_partitions+0x46/0xf0 drivers/block/loop.c:442
loop_change_fd drivers/block/loop.c:614 [inline]
lo_ioctl+0x1c57/0x1fc0 drivers/block/loop.c:1541
blkdev_ioctl+0x5e3/0x740 block/ioctl.c:797
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+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f13c019de99
RSP: 002b:00007f13c10dc028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f13c0426180 RCX: 00007f13c019de99
RDX: 000000000000000e RSI: 0000000000004c06 RDI: 000000000000000f
RBP: 00007f13c0233eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f13c0426218 R14: 00007f13c0426180 R15: 00007f13c054fa48
Showing all locks held in the system:
3 locks held by kworker/0:0/9:
1 lock held by khungtaskd/31:
#0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
1 lock held by klogd/4983:
2 locks held by getty/5382:
#0: ffff8880362f70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
5 locks held by kworker/u8:19/20103:
3 locks held by kworker/u8:21/22715:
#0: ffff888032f11140 ((wq_completion)loop9){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff888032f11140 ((wq_completion)loop9){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc90004a47c40 ((work_completion)(&worker->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc90004a47c40 ((work_completion)(&worker->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#2: ffff888027544ce8 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline]
#2: ffff888027544ce8 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: blkdev_read_iter+0x2df/0x420 block/fops.c:829
2 locks held by syz.1.5438/27423:
1 lock held by udevd/27635:
#0: ffff88802714a350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd70 block/bdev.c:948
1 lock held by syz.5.5564/27887:
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x3eb/0xee0 mm/readahead.c:517
1 lock held by syz.5.5564/27888:
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x3eb/0xee0 mm/readahead.c:517
1 lock held by syz.4.5603/28052:
#0: ffff88802714a350 (&disk->open_mutex){+.+.}-{4:4}, at: loop_reread_partitions+0x46/0xf0 drivers/block/loop.c:442
1 lock held by syz.4.5603/28053:
#0: ffff88802714a350 (&disk->open_mutex){+.+.}-{4:4}, at: loop_reread_partitions+0x46/0xf0 drivers/block/loop.c:442
1 lock held by syz-executor/28147:
#0: ffff88802714a350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd70 block/bdev.c:948
1 lock held by syz.6.5738/28640:
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x3eb/0xee0 mm/readahead.c:517
1 lock held by syz.6.5738/28641:
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x3eb/0xee0 mm/readahead.c:517
1 lock held by syz.3.5749/28716:
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x3eb/0xee0 mm/readahead.c:517
1 lock held by syz.3.5749/28717:
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
#0: ffff888027544e80 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x3eb/0xee0 mm/readahead.c:517
=============================================
NMI backtrace for cpu 1
CPU: 1 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 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [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:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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: 20097 Comm: kworker/u8:11 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: bat_events batadv_mcast_mla_update
RIP: 0010:mark_lock+0x0/0x190 kernel/locking/lockdep.c:4714
Code: 48 0f b9 3a 90 41 89 e9 48 89 df 48 8b 2c 24 e9 b6 fd ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 57 41 56 41 55 41 54 53 8b 46 20 89 c1 81 e1 00 00 03 00 83
RSP: 0018:ffffc90003ebf700 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff8880324d6910 RCX: ffffffff941b73d0
RDX: 0000000000000006 RSI: ffff8880324d68f0 RDI: ffff8880324d5d00
RBP: 0000000000000000 R08: ffffffff8b9af7ce R09: 0000000000000000
R10: 0000000000000000 R11: ffff88807f595828 R12: 00000000ffffff05
R13: ffff8880324d68f0 R14: ffff8880324d5d00 R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff888124f54000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005593f7a55168 CR3: 000000000e946000 CR4: 00000000003526f0
Call Trace:
mark_usage kernel/locking/lockdep.c:-1 [inline]
__lock_acquire+0x997/0x2cf0 kernel/locking/lockdep.c:5191
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158
spin_lock include/linux/spinlock.h:342 [inline]
__batadv_mcast_mla_update net/batman-adv/multicast.c:917 [inline]
batadv_mcast_mla_update+0x277e/0x3730 net/batman-adv/multicast.c:946
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245