------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=1 set at [] prepare_to_wait_exclusive+0x88/0x230 kernel/sched/wait.c:275 WARNING: kernel/sched/core.c:9161 at __might_sleep+0x92/0xf0 kernel/sched/core.c:9157, CPU#1: syz.5.1099/9524 Modules linked in: CPU: 1 UID: 0 PID: 9524 Comm: syz.5.1099 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:__might_sleep+0xac/0xf0 kernel/sched/core.c:9157 Code: 00 00 48 89 3c 24 41 89 f5 4c 8d 35 5e eb 07 0f 43 80 3c 3c 00 74 08 48 89 df e8 8f 7a a1 00 48 8b 0b 4c 89 f7 89 ee 48 89 ca <67> 48 0f b9 3a 44 89 ee 48 8b 3c 24 eb b5 44 89 f1 80 e1 07 80 c1 RSP: 0018:ffffc90000a18c08 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888026287668 RCX: ffffffff81a04408 RDX: ffffffff81a04408 RSI: 0000000000000001 RDI: ffffffff909ea740 RBP: 0000000000000001 R08: 0000000000000100 R09: 1ffffffff213756f R10: dffffc0000000000 R11: fffffbfff2137570 R12: 1ffff11004c50ecd R13: 00000000000011d4 R14: ffffffff909ea740 R15: dffffc0000000000 FS: 00007fcf69ce26c0(0000) GS:ffff888124963000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 0000000059c68000 CR4: 00000000003526f0 Call Trace: __cancel_work_sync+0x6d/0x110 kernel/workqueue.c:4564 mmc_free_host+0x19/0x30 drivers/mmc/core/host.c:699 call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2374 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 run_timer_base kernel/time/timer.c:2395 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__sanitizer_cov_trace_switch+0x0/0x110 kernel/kcov.c:323 Code: 08 07 00 00 00 48 89 7c 0a 10 48 89 74 0a 18 48 89 44 0a 20 e9 11 a7 30 0a cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 46 08 48 8d 48 ff 48 89 c2 48 31 ca 48 39 ca 0f RSP: 0018:ffffc9000437ef30 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8880597ca090 RCX: ffff888026285dc0 RDX: 0000000000000002 RSI: ffffffff905b8870 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff888026285dc0 R09: 0000000000000002 R10: 000000000000c0fe R11: 0000000000000002 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000 __ipv6_addr_type+0x1d9/0x2f0 net/ipv6/addrconf_core.c:69 ipv6_addr_scope include/net/ipv6.h:480 [inline] sctp_v6_scope+0x1a/0x80 net/sctp/ipv6.c:765 sctp_process_param net/sctp/sm_make_chunk.c:2569 [inline] sctp_process_init+0xe5f/0x2cf0 net/sctp/sm_make_chunk.c:2391 sctp_sf_do_unexpected_init+0xb9f/0x1340 net/sctp/sm_statefuns.c:1638 sctp_do_sm+0x239/0x5dd0 net/sctp/sm_sideeffect.c:1172 sctp_assoc_bh_rcv+0x401/0x6f0 net/sctp/associola.c:1048 sctp_backlog_rcv+0x15c/0x370 net/sctp/input.c:331 sk_backlog_rcv include/net/sock.h:1190 [inline] __release_sock+0x28b/0x390 net/core/sock.c:3263 release_sock+0x190/0x260 net/core/sock.c:3862 sctp_wait_for_connect+0x3a6/0x770 net/sctp/socket.c:9419 sctp_sendmsg_to_asoc+0x1759/0x1920 net/sctp/socket.c:1884 sctp_sendmsg+0x1bb5/0x2d00 net/sctp/socket.c:2039 sock_sendmsg_nosec+0x10e/0x180 net/socket.c:801 __sock_sendmsg net/socket.c:815 [inline] __sys_sendto+0x408/0x5a0 net/socket.c:2281 __do_sys_sendto net/socket.c:2288 [inline] __se_sys_sendto net/socket.c:2284 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2284 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcf68d9e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcf69ce2028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fcf69025fa0 RCX: 00007fcf68d9e159 RDX: 0000000000000001 RSI: 0000200000000040 RDI: 0000000000000004 RBP: 00007fcf68e35024 R08: 0000200000000200 R09: 000000000000001c R10: 0000000000008000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcf69026038 R14: 00007fcf69025fa0 R15: 00007ffcf8bee0d8 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 48 89 3c 24 mov %rdi,(%rsp) 6: 41 89 f5 mov %esi,%r13d 9: 4c 8d 35 5e eb 07 0f lea 0xf07eb5e(%rip),%r14 # 0xf07eb6e 10: 43 80 3c 3c 00 cmpb $0x0,(%r12,%r15,1) 15: 74 08 je 0x1f 17: 48 89 df mov %rbx,%rdi 1a: e8 8f 7a a1 00 call 0xa17aae 1f: 48 8b 0b mov (%rbx),%rcx 22: 4c 89 f7 mov %r14,%rdi 25: 89 ee mov %ebp,%esi 27: 48 89 ca mov %rcx,%rdx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 44 89 ee mov %r13d,%esi 32: 48 8b 3c 24 mov (%rsp),%rdi 36: eb b5 jmp 0xffffffed 38: 44 89 f1 mov %r14d,%ecx 3b: 80 e1 07 and $0x7,%cl 3e: 80 .byte 0x80 3f: c1 .byte 0xc1