INFO: task syz.0.766:13742 blocked for more than 143 seconds.
Not tainted 6.15.0-rc2-syzkaller-00404-g8560697b23dc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.766 state:D stack:24584 pid:13742 tgid:13741 ppid:12686 task_flags:0x440140 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline]
__down_read_common kernel/locking/rwsem.c:1248 [inline]
__down_read kernel/locking/rwsem.c:1261 [inline]
down_read+0x6ff/0xa50 kernel/locking/rwsem.c:1526
filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
page_cache_ra_order+0x45e/0xca0 mm/readahead.c:491
filemap_get_pages+0x59f/0x1fc0 mm/filemap.c:2591
filemap_splice_read+0x690/0xef0 mm/filemap.c:2981
do_splice_read fs/splice.c:979 [inline]
splice_direct_to_actor+0x4af/0xc90 fs/splice.c:1083
do_splice_direct_actor fs/splice.c:1201 [inline]
do_splice_direct+0x281/0x3d0 fs/splice.c:1227
do_sendfile+0x582/0x8c0 fs/read_write.c:1368
__do_sys_sendfile64 fs/read_write.c:1429 [inline]
__se_sys_sendfile64+0x17e/0x1e0 fs/read_write.c:1415
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb316d8e169
RSP: 002b:00007fb317b12038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fb316fb5fa0 RCX: 00007fb316d8e169
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007fb316e10a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb316fb5fa0 R15: 00007ffd54fb72d8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6764
3 locks held by kworker/u8:2/36:
2 locks held by getty/5580:
#0: ffff88814db980a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222
3 locks held by kworker/1:3/5831:
#0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffffc9000415fc60 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc9000415fc60 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
#2: ffff8880355db240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x316/0x3f10 drivers/net/netdevsim/fib.c:1490
3 locks held by kworker/u8:9/6833:
#0: ffff88814ddf3148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88814ddf3148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffffc900043ffc60 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900043ffc60 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
#2: ffffffff900eb2c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff900eb2c8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x110/0x16a0 net/ipv6/addrconf.c:4195
1 lock held by syz.5.496/10662:
1 lock held by syz.0.766/13742:
#0: ffff888148c07c40 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#0: ffff888148c07c40 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_order+0x45e/0xca0 mm/readahead.c:491
1 lock held by syz.1.896/14786:
#0: ffff888148c07c40 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#0: ffff888148c07c40 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_order+0x45e/0xca0 mm/readahead.c:491
1 lock held by syz.6.925/15371:
#0: ffff888148c07c40 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#0: ffff888148c07c40 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_order+0x45e/0xca0 mm/readahead.c:491
2 locks held by syz-executor/15662:
#0: ffff8880315ea0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880315ea0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880315ea0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
#1: ffffffff8ed43300 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:3774
2 locks held by syz-executor/15808:
1 lock held by syz.3.1010/15844:
#0: ffff888148c07c40 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#0: ffff888148c07c40 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_order+0x45e/0xca0 mm/readahead.c:491
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc2-syzkaller-00404-g8560697b23dc #0 PREEMPT(full)
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+0x4ab/0x4e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:437
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
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: 6833 Comm: kworker/u8:9 Not tainted 6.15.0-rc2-syzkaller-00404-g8560697b23dc #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:fib6_add+0x1da/0x4420 net/ipv6/ip6_fib.c:1403
Code: 50 48 8d 58 60 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 4c 89 54 24 08 0f 85 3e 3c 00 00 44 8b 03 <4c> 89 e7 48 8b b4 24 a8 00 00 00 4c 89 f2 4c 89 f9 41 b9 50 00 00
RSP: 0018:ffffc900043ff380 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888057200460 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffff888057200400 RDI: ffff8880281d6458
RBP: ffffc900043ff5b0 R08: 0000000000000080 R09: fffff5200087fea8
R10: 0000000000000001 R11: fffff5200087fea8 R12: ffff88806558c000
R13: 0000000000000000 R14: ffff8880281d6458 R15: ffff888057200450
FS: 0000000000000000(0000) GS:ffff888124fcf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7920d5f000 CR3: 0000000032f6e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__ip6_ins_rt net/ipv6/route.c:1351 [inline]
ip6_ins_rt+0x118/0x190 net/ipv6/route.c:1361
__ipv6_ifa_notify+0x55a/0x1020 net/ipv6/addrconf.c:6283
ipv6_ifa_notify net/ipv6/addrconf.c:6322 [inline]
addrconf_dad_completed+0x183/0xcd0 net/ipv6/addrconf.c:4321
addrconf_dad_work+0xdbe/0x16a0 net/ipv6/addrconf.c:-1
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245