------------[ 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#0: syz.4.2860/15522 Modules linked in: CPU: 0 UID: 0 PID: 15522 Comm: syz.4.2860 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 96 e6 0e 43 80 3c 3c 00 74 08 48 89 df e8 0f 10 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:ffffc90000007c08 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88802a2a37e8 RCX: ffffffff81a005a8 RDX: ffffffff81a005a8 RSI: 0000000000000001 RDI: ffffffff907d1460 RBP: 0000000000000001 R08: 0000000000000100 R09: 1ffffffff20f42cf R10: dffffc0000000000 R11: fffffbfff20f42d0 R12: 1ffff110054546fd R13: 00000000000011d1 R14: ffffffff907d1460 R15: dffffc0000000000 FS: 00007fbc81d2d6c0(0000) GS:ffff888124cd9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fedc67eb840 CR3: 0000000012158000 CR4: 00000000003526f0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000086 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __cancel_work_sync+0x6d/0x110 kernel/workqueue.c:4561 mmc_free_host+0x19/0x30 drivers/mmc/core/host.c:700 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:767 irq_exit_rcu+0x9/0x30 kernel/softirq.c:784 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:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x32/0xb0 kernel/rcu/tree.c:753 Code: 53 65 48 ff 05 6f 21 e8 11 e8 0a 13 38 0a 89 c3 83 f8 08 73 66 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd d0 67 74 8e 4c 89 f0 <48> c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 4b 3f 8b 00 48 c7 c3 RSP: 0018:ffffc900070e6ca8 EFLAGS: 00000293 RAX: ffffffff8e7467d0 RBX: 0000000000000000 RCX: 8000000000000001 RDX: 0000000000000000 RSI: ffffffff8c6d9460 RDI: ffffffff8c6d9420 RBP: 1ffff92000e1cdc8 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc900070e6e58 R11: ffffffff81b27650 R12: ffffffff8ed5c6e0 R13: 0000000000000002 R14: ffffffff8e7467d0 R15: dffffc0000000000 trace_lock_acquire include/trace/events/lock.h:23 [inline] lock_acquire+0x58/0x350 kernel/locking/lockdep.c:5871 rcu_lock_acquire include/linux/rcupdate.h:309 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] class_rcu_constructor include/linux/rcupdate.h:1216 [inline] unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6499 [inline] kmem_cache_free+0x182/0x650 mm/slub.c:6626 sctp_chunk_destroy net/sctp/sm_make_chunk.c:1495 [inline] sctp_chunk_put+0x17d/0x200 net/sctp/sm_make_chunk.c:1522 sctp_inq_chunk_free net/sctp/inqueue.c:46 [inline] sctp_inq_pop+0xd06/0x1160 net/sctp/inqueue.c:144 sctp_assoc_bh_rcv+0x12c/0x6f0 net/sctp/associola.c:990 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+0x37f/0x6e0 net/sctp/socket.c:9419 sctp_sendmsg_to_asoc+0x16cd/0x1880 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_sendmsg+0x54e/0x850 net/socket.c:2713 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767 __sys_sendmsg net/socket.c:2799 [inline] __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802 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: 0033:0x7fbc80d9e159 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:00007fbc81d2d028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fbc81025fa0 RCX: 00007fbc80d9e159 RDX: 0000000000000001 RSI: 0000200000000700 RDI: 0000000000000004 RBP: 00007fbc80e35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbc81026038 R14: 00007fbc81025fa0 R15: 00007fbc8114fa48 ---------------- 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 96 e6 0e lea 0xee6965e(%rip),%r14 # 0xee6966e 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 0f 10 a1 00 call 0xa1102e 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