INFO: task syz.9.1929:18121 blocked for more than 143 seconds.
Tainted: G W 6.17.0-rc2-syzkaller-00028-gbe48bcf004f9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.1929 state:D stack:17448 pid:18121 tgid:18120 ppid:17295 task_flags:0x440140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
schedule[ 1009.507786][ T38] __schedule_loop kernel/sched/core.c:7043 [inline]
schedule[ 1009.507786][ T38] schedule+0x165/0x360 kernel/sched/core.c:7058
__bch2_two_state_lock+0x1ea/0x370 fs/bcachefs/two_state_shared_lock.c:7
bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:55 [inline]
bch2_readahead+0x94f/0x1100 fs/bcachefs/fs-io-buffered.c:296
read_pages+0x177/0x580 mm/readahead.c:160
page_cache_ra_unbounded+0x63b/0x740 mm/readahead.c:297
filemap_readahead mm/filemap.c:2572 [inline]
filemap_get_pages+0xaed/0x1df0 mm/filemap.c:2617
filemap_splice_read+0x587/0xc60 mm/filemap.c:2991
do_splice_read fs/splice.c:979 [inline]
splice_direct_to_actor+0x4b1/0xcd0 fs/splice.c:1083
do_splice_direct_actor fs/splice.c:1201 [inline]
do_splice_direct+0x187/0x270 fs/splice.c:1227
vfs_copy_file_range+0xad7/0x1330 fs/read_write.c:1627
__do_sys_copy_file_range fs/read_write.c:1677 [inline]
__se_sys_copy_file_range+0x2fb/0x470 fs/read_write.c:1644
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: 0033:0x7f0d27fcebe9
RSP: 002b:00007f0d26236038 EFLAGS: 00000246 ORIG_RAX: 0000000000000146
RAX: ffffffffffffffda RBX: 00007f0d281f5fa0 RCX: 00007f0d27fcebe9
RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 00007f0d28051e19 R08: 0000000000400000 R09: 0000000000000000
R10: 00002000000000c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d281f6038 R14: 00007f0d281f5fa0 R15: 00007ffd21975eb8
INFO: task syz.9.1929:18157 blocked for more than 143 seconds.
Tainted: G W 6.17.0-rc2-syzkaller-00028-gbe48bcf004f9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.1929 state:D stack:27096 pid:18157 tgid:18120 ppid:17295 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
io_schedule+0x81/0xe0 kernel/sched/core.c:7903
folio_wait_bit_common+0x6b5/0xb90 mm/filemap.c:1317
folio_lock include/linux/pagemap.h:1133 [inline]
bch2_mark_pagecache_unallocated+0x3a2/0x930 fs/bcachefs/fs-io-pagecache.c:275
bch2_remap_file_range+0x931/0xd20 fs/bcachefs/fs-io.c:933
vfs_copy_file_range+0xd77/0x1330 fs/read_write.c:1591
__do_sys_copy_file_range fs/read_write.c:1677 [inline]
__se_sys_copy_file_range+0x2fb/0x470 fs/read_write.c:1644
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: 0033:0x7f0d27fcebe9
RSP: 002b:00007f0d26215038 EFLAGS: 00000246 ORIG_RAX: 0000000000000146
RAX: ffffffffffffffda RBX: 00007f0d281f6090 RCX: 00007f0d27fcebe9
RDX: 0000000000000009 RSI: 0000000000000000 RDI: 000000000000000a
RBP: 00007f0d28051e19 R08: 0000000000400000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d281f6128 R14: 00007f0d281f6090 R15: 00007ffd21975eb8
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Tainted: G W 6.17.0-rc2-syzkaller-00028-gbe48bcf004f9 #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/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: 16444 Comm: udevd Tainted: G W 6.17.0-rc2-syzkaller-00028-gbe48bcf004f9 #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:check_preemption_disabled+0x5/0x120 lib/smp_processor_id.c:13
Code: 48 c7 c6 e0 0c 62 8b eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 <53> 48 83 ec 10 65 48 8b 05 fe 74 ff 06 48 89 44 24 08 65 8b 05 06
RSP: 0018:ffffc9000445f1a0 EFLAGS: 00000283
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8b620ce0 RDI: ffffffff8b620ca0
RBP: ffffffff8213467c R08: 0000000000000001 R09: 0000000000000000
R10: ffff88802841c460 R11: ffffffff81aadf70 R12: 0000000000000000
R13: ffff8880b89456d8 R14: 0000000000000000 R15: 0000000000000001
FS: 00007fc61f775880(0000) GS:ffff8881269c5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2e53819286 CR3: 000000007afbe000 CR4: 00000000003526f0
Call Trace:
rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:751
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x5f/0x360 kernel/locking/lockdep.c:5831
rt_spin_lock+0x88/0x2c0 kernel/locking/spinlock_rt.c:56
spin_lock include/linux/spinlock_rt.h:44 [inline]
___slab_alloc+0x25c/0xdd0 mm/slub.c:3768
__slab_alloc mm/slub.c:3981 [inline]
__slab_alloc_node mm/slub.c:4056 [inline]
slab_alloc_node mm/slub.c:4217 [inline]
kmem_cache_alloc_node_noprof+0xf2/0x330 mm/slub.c:4281
__alloc_skb+0x112/0x2d0 net/core/skbuff.c:659
alloc_skb include/linux/skbuff.h:1336 [inline]
nlmsg_new include/net/netlink.h:1055 [inline]
audit_buffer_alloc kernel/audit.c:1795 [inline]
audit_log_start+0x152/0x850 kernel/audit.c:1913
common_lsm_audit+0xba/0x2e0 security/lsm_audit.c:442
smack_log+0x394/0x3f0 security/smack/smack_access.c:391
smk_tskacc+0x2fc/0x370 security/smack/smack_access.c:255
smack_inode_permission+0x28f/0x320 security/smack/smack_lsm.c:1217
security_inode_permission+0xf8/0x310 security/security.c:2324
may_lookup fs/namei.c:1836 [inline]
link_path_walk+0x232/0xea0 fs/namei.c:2445
path_lookupat+0x97/0x430 fs/namei.c:2653
filename_lookup+0x212/0x570 fs/namei.c:2683
vfs_statx+0xf8/0x550 fs/stat.c:353
vfs_fstatat+0x118/0x170 fs/stat.c:375
__do_sys_newfstatat fs/stat.c:542 [inline]
__se_sys_newfstatat fs/stat.c:536 [inline]
__x64_sys_newfstatat+0x116/0x190 fs/stat.c:536
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: 0033:0x7fc61f8cdb0a
Code: 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 8b 15 b9 f2 0d 00 f7
RSP: 002b:00007ffe9dfbbfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007ffe9dfbc8e0 RCX: 00007fc61f8cdb0a
RDX: 00007ffe9dfbc050 RSI: 00007ffe9dfbc4e0 RDI: 00000000ffffff9c
RBP: 00007ffe9dfbc4e0 R08: c0c2080000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000055be12c1f160
R13: 000055be12c1a1b0 R14: 000055be12c0f538 R15: 000055bdf3863bcc