rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2675 jiffies s: 51745 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7916 Comm: syz.1.596 Not tainted 6.11.0-rc1-next-20240729-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:io_serial_in+0x76/0xb0 drivers/tty/serial/8250/8250_port.c:406
Code: 40 db 51 fc 89 e9 41 d3 e6 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 51 60 b9 fc 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d c3 cc cc cc cc 89 e9 80 e1 07 38 c1 7c
RSP: 0018:ffffc900000072f8 EFLAGS: 00000002
RAX: 1ffffffff2a4bb00 RBX: ffffffff9525df20 RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff8541f016 R09: 1ffff110040bf046
R10: dffffc0000000000 R11: ffffffff8541efd0 R12: dffffc0000000000
R13: ffffffff94f6ff20 R14: 00000000000003fd R15: dffffc0000000000
FS:  00007f93805336c0(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feed1d25bc6 CR3: 0000000055bce000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 serial_in drivers/tty/serial/8250/8250.h:137 [inline]
 serial_lsr_in drivers/tty/serial/8250/8250.h:159 [inline]
 wait_for_lsr drivers/tty/serial/8250/8250_port.c:2068 [inline]
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3315 [inline]
 serial8250_console_write+0x1373/0x1ed0 drivers/tty/serial/8250/8250_port.c:3393
 console_emit_next_record kernel/printk/printk.c:3030 [inline]
 console_flush_all+0x880/0xf50 kernel/printk/printk.c:3102
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3173
 vprintk_emit+0x7a1/0x900 kernel/printk/printk.c:2423
 _printk+0xd5/0x120 kernel/printk/printk.c:2450
 print_lock_name+0x242/0x3a0 kernel/locking/lockdep.c:742
 print_lock+0x117/0x1b0 kernel/locking/lockdep.c:779
 lockdep_print_held_locks+0x14c/0x210 kernel/locking/lockdep.c:800
 debug_show_all_locks+0x197/0x2a0 kernel/locking/lockdep.c:6699
 report_rtnl_holders+0x3b4/0x400 net/core/rtnetlink.c:115
 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792
 expire_timers kernel/time/timer.c:1843 [inline]
 __run_timers kernel/time/timer.c:2417 [inline]
 __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428
 run_timer_base kernel/time/timer.c:2437 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__unwind_start+0x446/0x7c0 arch/x86/kernel/unwind_orc.c:729
Code: 84 c0 0f 85 74 03 00 00 40 88 2b b0 01 89 04 24 48 bd 00 00 00 00 00 fc ff df 49 8d 5e 38 48 89 d8 48 c1 e8 03 48 89 44 24 18 <80> 3c 28 00 74 08 48 89 df e8 2c 15 ba 00 48 89 5c 24 20 48 8b 1b
RSP: 0018:ffffc900093def58 EFLAGS: 00000a06
RAX: 1ffff9200127bdff RBX: ffffc900093deff8 RCX: dffffc0000000000
RDX: ffffffff814139cc RSI: 000000000003ffff RDI: 0000000000040000
RBP: dffffc0000000000 R08: ffffc900093df01f R09: 0000000000000000
R10: ffffc900093defc0 R11: fffff5200127be04 R12: ffffc900093deff8
R13: ffffc900093defe8 R14: ffffc900093defc0 R15: 1ffff9200127bdfd
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0x103/0x1b0 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3988 [inline]
 slab_alloc_node mm/slub.c:4037 [inline]
 kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4044
 alloc_buffer_head+0x2a/0x290 fs/buffer.c:3025
 folio_alloc_buffers+0x241/0x5b0 fs/buffer.c:929
 create_empty_buffers+0x3a/0x740 fs/buffer.c:1671
 block_read_full_folio+0x25c/0xcd0 fs/buffer.c:2387
 filemap_read_folio+0x1a0/0x790 mm/filemap.c:2355
 do_read_cache_folio+0x134/0x820 mm/filemap.c:3789
 do_read_cache_page+0x30/0x200 mm/filemap.c:3855
 read_mapping_page include/linux/pagemap.h:907 [inline]
 dir_get_page fs/sysv/dir.c:64 [inline]
 sysv_find_entry+0x1af/0x410 fs/sysv/dir.c:157
 sysv_inode_by_name+0x98/0x1f0 fs/sysv/dir.c:374
 sysv_lookup+0x6b/0xe0 fs/sysv/namei.c:38
 lookup_open fs/namei.c:3556 [inline]
 open_last_lookups fs/namei.c:3647 [inline]
 path_openat+0x11cc/0x3470 fs/namei.c:3883
 do_filp_open+0x235/0x490 fs/namei.c:3913
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1442
 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: 0033:0x7f937f777299
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RAX: ffffffffffffffda RBX: 00007f937f905f80 RCX: 00007f937f777299
RDX: 00000000000026e1 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 00007f937f7e48e6 R08: 0000000000000000 R09: 0000000000000000
R10: 000000001c000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f937f905f80 R15: 00007fff77ee4718
 </TASK>
, at: hci_cmd_sync_work+0x2c8/0x400 net/bluetooth/hci_sync.c:311
3 locks held by kworker/1:5/5288:
 #0: ffff888015880948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff888015880948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: ffffc90003a27d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc90003a27d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
 #1: ffffc90003347d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc90003347d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4194
4 locks held by syz.1.596/7916:
 #0: ffff88802e8fe420 (sb_writers#30){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
 #1: ffff888058238180 (&type->i_mutex_dir_key#25){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:799 [inline]
 #1: ffff888058238180 (&type->i_mutex_dir_key#25){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3644 [inline]
 #1: ffff888058238180 (&type->i_mutex_dir_key#25){+.+.}-{3:3}, at: path_openat+0x7fb/0x3470 fs/namei.c:3883
 #2: ffffc90000007c00 (net/core/rtnetlink.c:83){+.-.}-{0:0}, at: call_timer_fn+0xc0/0x650 kernel/time/timer.c:1789
 #3: ffffffff8e937a60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 #3: ffffffff8e937a60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #3: ffffffff8e937a60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6695
1 lock held by syz-executor/10194:
 #0: ffffffff8e93ce38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
 #0: ffffffff8e93ce38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:967
4 locks held by syz-executor/10220:
 #2: ffff888022ced3c8 (kn->active#51){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8f51eae8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x1b4/0x890 drivers/net/netdevsim/bus.c:166
4 locks held by syz-executor/10222:
 #0: ffff88803053c420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2876 [inline]
 #0: ffff88803053c420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586
 #1: ffff88802b96a888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff888022ced4b8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8f51eae8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
7 locks held by syz-executor/10223:
 #0: ffff88803053c420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2876 [inline]
 #0: ffff88803053c420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586
 #1: ffff8880635e2088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff888022ced4b8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8f51eae8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
 #4: ffff88805c87c0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline]
 #4: ffff88805c87c0e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1094 [inline]
 #4: ffff88805c87c0e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1292
 #5: ffff88805c87d250 (&devlink->lock_key#32){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672
 #6: ffffffff8e93ce38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
 #6: ffffffff8e93ce38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:967
1 lock held by syz-executor/10259:
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:149 [inline]
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: __rtnl_newlink net/core/rtnetlink.c:3807 [inline]
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_newlink+0xa0d/0x2070 net/core/rtnetlink.c:3830
1 lock held by syz-executor/10262:
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:149 [inline]
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6eb/0xd00 net/core/rtnetlink.c:6731
1 lock held by syz-executor/10272:
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:149 [inline]
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6eb/0xd00 net/core/rtnetlink.c:6731
1 lock held by syz-executor/10274:
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:149 [inline]
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6eb/0xd00 net/core/rtnetlink.c:6731
1 lock held by syz-executor/10276:
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:149 [inline]
 #0: ffffffff8fc81d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6eb/0xd00 net/core/rtnetlink.c:6731
1 lock held by dhcpcd-run-hook/10291:

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