syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.1.8:5936]
Modules linked in:
irq event stamp: 16741973
hardirqs last  enabled at (16741972): [<ffffffff8b649414>] irqentry_exit+0x74/0x90 kernel/entry/common.c:310
hardirqs last disabled at (16741973): [<ffffffff8b647f5e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050
softirqs last  enabled at (9203504): [<ffffffff8185919a>] __do_softirq kernel/softirq.c:613 [inline]
softirqs last  enabled at (9203504): [<ffffffff8185919a>] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last  enabled at (9203504): [<ffffffff8185919a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
softirqs last disabled at (9203507): [<ffffffff8185919a>] __do_softirq kernel/softirq.c:613 [inline]
softirqs last disabled at (9203507): [<ffffffff8185919a>] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last disabled at (9203507): [<ffffffff8185919a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
CPU: 0 UID: 0 PID: 5936 Comm: syz.1.8 Not tainted 6.15.0-syzkaller-gcd2e103d57e5 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:32 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:127 [inline]
RIP: 0010:rcu_read_unlock_special+0xe7/0x4c0 kernel/rcu/tree_plugin.h:649
Code: 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 51 9e bf 09 cc 49 89 ff 48 c7 84 24 80 00 00 00 00 00 00 00 9c 8f 84 24 80 00 00 00 <4c> 8b a4 24 80 00 00 00 fa 41 f7 c4 00 02 00 00 74 0f e8 72 0c 20
RSP: 0018:ffffc90000006de0 EFLAGS: 00000246
RAX: f2f2f200f1f1f1f1 RBX: 1ffff92000000dc4 RCX: 52181ace67eb0400
RDX: 0000000000000001 RSI: ffffffff8db5d717 RDI: ffff8880252bbc00
RBP: ffffc90000006ed8 R08: ffffc90000007b88 R09: 0000000000000000
R10: ffffc90000007038 R11: fffff52000000e09 R12: 1ffff11004a57808
R13: dffffc0000000000 R14: 0000000000000101 R15: ffff8880252bbc00
FS:  00007f56014d96c0(0000) GS:ffff888125c5f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30310ff8 CR3: 000000007e68c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438
 rcu_read_unlock include/linux/rcupdate.h:873 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0x19ae/0x2390 arch/x86/kernel/unwind_orc.c:680
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf5/0x1f0 mm/page_owner.c:156
 __set_page_owner+0x8d/0x4a0 mm/page_owner.c:329
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
 alloc_frozen_pages_noprof mm/mempolicy.c:2490 [inline]
 alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2510
 skb_page_frag_refill+0x179/0x320 net/core/sock.c:3150
 add_recvbuf_mergeable drivers/net/virtio_net.c:2702 [inline]
 try_fill_recv+0x8cd/0x20e0 drivers/net/virtio_net.c:2757
 virtnet_receive drivers/net/virtio_net.c:2953 [inline]
 virtnet_poll+0x2167/0x2d90 drivers/net/virtio_net.c:3045
 __napi_poll+0xc7/0x480 net/core/dev.c:7414
 napi_poll net/core/dev.c:7478 [inline]
 net_rx_action+0x707/0xe30 net/core/dev.c:7605
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738
RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7104
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 8b 0a 2b f6 e8 d6 1b 62 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000529ecc0 EFLAGS: 00000282
RAX: 52181ace67eb0400 RBX: 0000000000000000 RCX: 52181ace67eb0400
RDX: 0000000000000006 RSI: ffffffff8d9705ba RDI: 0000000000000001
RBP: ffffc9000529ed60 R08: ffffffff8fa0bcf7 R09: 1ffffffff1f4179e
R10: dffffc0000000000 R11: fffffbfff1f4179f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000a53d98
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:inet_diag_dump_icsk+0x7e4/0x1f40 net/ipv4/inet_diag.c:1110
Code: 60 48 83 c0 30 48 89 84 24 80 00 00 00 48 c1 e8 03 48 89 44 24 78 ba 80 00 00 00 48 8d bc 24 30 01 00 00 31 f6 e8 ac 8d 22 f8 <ba> 40 00 00 00 48 8d bc 24 d0 01 00 00 31 f6 e8 98 8d 22 f8 48 8b
RSP: 0018:ffffc9000529ee20 EFLAGS: 00000246
RAX: ffffc9000529ef50 RBX: ffffc90001ad5c30 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000529efd0
RBP: ffffc9000529f1b0 R08: ffffc9000529efcf R09: 0000000000000000
R10: ffffc9000529ef50 R11: fffff52000a53dfa R12: 0000000000000000
R13: dffffc0000000000 R14: ffffc90001a80000 R15: ffff88805ea78000
 __inet_diag_dump net/ipv4/inet_diag.c:1283 [inline]
 inet_diag_dump_compat+0x257/0x460 net/ipv4/inet_diag.c:1390
 netlink_dump+0x62a/0xe20 net/netlink/af_netlink.c:2309
 __netlink_dump_start+0x5cb/0x7e0 net/netlink/af_netlink.c:2424
 netlink_dump_start include/linux/netlink.h:341 [inline]
 inet_diag_rcv_msg_compat+0x1ea/0x3b0 net/ipv4/inet_diag.c:1425
 sock_diag_rcv_msg+0x4c9/0x600 net/core/sock_diag.c:-1
 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x219/0x270 net/socket.c:727
 ____sys_sendmsg+0x505/0x830 net/socket.c:2566
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
 __sys_sendmsg net/socket.c:2652 [inline]
 __do_sys_sendmsg net/socket.c:2657 [inline]
 __se_sys_sendmsg net/socket.c:2655 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655
 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: 0033:0x7f560058e929
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
RSP: 002b:00007f56014d9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f56007b5fa0 RCX: 00007f560058e929
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 000000000000000a
RBP: 00007f5600610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f56007b5fa0 R15: 00007ffcfdfead38
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5965 Comm: kworker/u9:7 Not tainted 6.15.0-syzkaller-gcd2e103d57e5 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: hci5 hci_rx_work
RIP: 0010:prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2185
Code: f6 49 89 ff 65 48 8b 05 82 e9 f9 10 48 89 44 24 08 e8 38 14 1e 00 4c 89 34 24 48 89 e6 4c 89 ff 48 89 da 31 c9 e8 34 00 00 00 <65> 48 8b 0d 5c e9 f9 10 48 3b 4c 24 08 75 0f 48 83 c4 10 5b 41 5e
RSP: 0018:ffffc900054870b0 EFLAGS: 00000246
RAX: ffffffff81a23101 RBX: ffffc90005487220 RCX: f8f1a54087047800
RDX: ffffc90019a03000 RSI: 000000000000bc58 RDI: 000000000000bc59
RBP: ffffc900054872b0 R08: ffff88802f2fbc00 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000002 R12: ffffc900054871a0
R13: 1ffff92000a90e28 R14: 00000000000009c2 R15: ffffffff8e054fa0
FS:  0000000000000000(0000) GS:ffff888125d5f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005602a8ce6e08 CR3: 0000000077e14000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 printk_get_next_message+0x15c/0x7b0 kernel/printk/printk.c:3005
 console_emit_next_record kernel/printk/printk.c:3092 [inline]
 console_flush_all+0x4ca/0xc40 kernel/printk/printk.c:3226
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0xc4/0x270 kernel/printk/printk.c:3325
 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450
 _printk+0xcf/0x120 kernel/printk/printk.c:2475
 bt_warn+0x10b/0x160 net/bluetooth/lib.c:276
 hci_cc_func net/bluetooth/hci_event.c:4205 [inline]
 hci_cmd_complete_evt+0x46a/0x950 net/bluetooth/hci_event.c:4229
 hci_event_func net/bluetooth/hci_event.c:7508 [inline]
 hci_event_packet+0x78f/0x1200 net/bluetooth/hci_event.c:7565
 hci_rx_work+0x46a/0xe80 net/bluetooth/hci_core.c:4036
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>