WARNING in mmc_free_host

Status: upstream: reported on 2026/08/19 18:13
Subsystems: mmc
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+82a0a7de6d84867d030e@syzkaller.appspotmail.com
First crash: 67d, last: 1d15h
▶ ▼ ✨ AI Jobs (4)
ID Workflow Result Correct Bug Created Started Finished Revision
2edec3cb repro-c Reproduced: ✅ ❓ WARNING in mmc_free_host 2026/09/04 19:36 2026/09/04 19:36 2026/09/04 21:17 7ce8fcf4
f5ecb5e5 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in mmc_free_host 2026/08/22 00:47 2026/08/22 00:47 2026/08/22 01:40 1e72964b
8664227c assessment-security 💥 WARNING in mmc_free_host 2026/08/19 01:37 2026/08/19 01:37 2026/08/19 01:37 1e72964b
ef5561ba assessment-security 💥 WARNING in mmc_free_host 2026/08/17 02:15 2026/08/17 02:15 2026/08/17 02:15 746171ee
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly mmc report (Sep 2026) 0 (1) 2026/09/02 20:33
[syzbot] [mmc?] WARNING in mmc_free_host 0 (1) 2026/08/19 18:13
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING in mmc_free_host -1 1 62d 62d 0/2 upstream: reported on 2026/08/20 22:09
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/09/04 21:17 14m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git bc35965f6940a9bf834d54187b6088b8eb09206d report job log log

Sample crash report:
------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=2001 set at [<ffffffff81bb7af4>] futex_wait_setup+0x3c4/0x590 kernel/futex/waitwake.c:694
WARNING: kernel/sched/core.c:9191 at __might_sleep+0x92/0xf0 kernel/sched/core.c:9187, CPU#1: syz.2.9/5744
Modules linked in:
CPU: 1 UID: 0 PID: 5744 Comm: syz.2.9 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__might_sleep+0xac/0xf0 kernel/sched/core.c:9187
Code: 00 00 48 89 3c 24 41 89 f5 4c 8d 35 8e ca e6 0f 43 80 3c 3c 00 74 08 48 89 df e8 0f 4c a2 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:ffffc90000a08c08 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88802dae5730 RCX: ffffffff81bb7af4
RDX: ffffffff81bb7af4 RSI: 0000000000002001 RDI: ffffffff917d83c0
RBP: 0000000000002001 R08: 0000000000000100 R09: 1ffffffff22f508f
R10: dffffc0000000000 R11: fffffbfff22f5090 R12: 1ffff11005b5cae6
R13: 00000000000011d1 R14: ffffffff917d83c0 R15: dffffc0000000000
FS:  00007fb22e4dd6c0(0000) GS:ffff888123bbb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005567388b6150 CR3: 00000000798a4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __cancel_work_sync+0x6d/0x110 kernel/workqueue.c:4561
 mmc_free_host+0x19/0x40 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: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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:plist_check_list+0x3f/0x310 lib/plist.c:46
Code: 00 00 00 fc ff df e8 00 ed e3 f5 48 89 d8 48 c1 e8 03 48 89 44 24 10 42 80 3c 30 00 74 08 48 89 df e8 05 cd 54 f6 48 89 1c 24 <4c> 8b 33 4d 8d 7e 08 4c 89 fd 48 c1 ed 03 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90004c6f8d0 EFLAGS: 00000246
RAX: 1ffff110056a24d1 RBX: ffff88802b512688 RCX: 0000000000080000
RDX: ffffc900060ea000 RSI: 000000000000024b RDI: 000000000000024c
RBP: 0000000000000064 R08: ffff88802dae3e9b R09: 1ffff11005b5c7d3
R10: dffffc0000000000 R11: ffffed1005b5c7d4 R12: ffffc90004c6fab8
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff88802b512688
 __futex_queue+0xed/0x160 kernel/futex/core.c:872
 futex_queue kernel/futex/futex.h:333 [inline]
 futex_wait_setup+0x424/0x590 kernel/futex/waitwake.c:695
 __futex_wait+0x175/0x470 kernel/futex/waitwake.c:717
 futex_wait+0x121/0x390 kernel/futex/waitwake.c:750
 do_futex+0x3e7/0x4e0 kernel/futex/syscalls.c:133
 __do_sys_futex kernel/futex/syscalls.c:210 [inline]
 __se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:191
 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: 0033:0x7fb22d59f559
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:00007fb22e4dd0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fb22d825fa8 RCX: 00007fb22d59f559
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb22d825fa8
RBP: 00007fb22d825fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb22d826038 R14: 00007fb22d94f960 R15: 00007fb22d94fa48
 </TASK>
----------------
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 8e ca e6 0f 	lea    0xfe6ca8e(%rip),%r14        # 0xfe6ca9e
  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 4c a2 00       	call   0xa24c2e
  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

Crashes (55):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/20 14:36 upstream f47d223627f8 df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/10/15 05:39 upstream 4056b3c9d3c9 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/10/15 04:00 upstream 4056b3c9d3c9 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/10/13 22:51 upstream 24a19b953e2a 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/10/13 13:25 upstream 24a19b953e2a 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/10/09 19:01 upstream af32da41b032 a8add9cd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/10/08 09:43 upstream 7b63ef2d55f2 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/10/06 21:31 upstream 69f80fef3153 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/10/04 08:40 upstream a74306e2e676 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/10/04 06:57 upstream a74306e2e676 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/10/04 05:19 upstream a74306e2e676 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/10/03 11:21 upstream e767a4ea70a3 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/27 19:44 upstream efb44d93a620 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/25 13:55 upstream 165768bb7026 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/24 14:59 upstream 62f4c998b297 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/24 05:34 upstream 62f4c998b297 0a1606bc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/09/21 22:02 upstream f0100363d8c3 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/21 06:47 upstream 93f51579e7df 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/20 03:50 upstream 40288c9206c1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/09/17 09:32 upstream 238650ef6c7c 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/09/17 00:39 upstream 9b87fdc9af2f 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/15 18:54 upstream 587858367581 81a27d1a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/15 07:08 upstream 587858367581 81a27d1a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/13 03:09 upstream cba2348ab114 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/09/12 20:25 upstream 5225b8eec4c9 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/12 16:32 upstream 5225b8eec4c9 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/12 11:43 upstream 5225b8eec4c9 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/08 21:43 upstream 28924df2a08f 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/09/06 18:31 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/05 00:18 upstream bc35965f6940 3f042c7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/09/04 04:48 upstream 841e384b841a 801f0966 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/09/03 16:06 upstream 940de590b839 6a988719 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/09/02 06:13 upstream 89a312991dc6 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/08/31 14:17 upstream cee9395acd80 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/08/29 02:56 upstream 1b78070aaef6 bcbc8ceb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/08/26 05:31 upstream 45c13f3f9e3b 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in mmc_free_host
2026/08/25 10:01 upstream 66498c75b4f8 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/08/22 09:24 upstream 26260251022f 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/08/21 11:59 upstream 818bebeb63dd 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mmc_free_host
2026/10/02 02:00 upstream d24e8ac715de 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/09/21 05:53 upstream 50d05c7c76c9 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/09/19 17:08 upstream 50d05c7c76c9 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/09/19 16:15 upstream 50d05c7c76c9 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/09/13 19:21 upstream 50d05c7c76c9 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/09/12 16:10 upstream 50d05c7c76c9 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/09/11 13:02 upstream 50d05c7c76c9 b6a5eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/09/02 04:04 upstream 786262be6048 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/08/28 06:33 upstream 1b78070aaef6 e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/08/25 07:27 upstream 66498c75b4f8 23caa175 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/08/17 12:41 upstream 8d3ae59288f1 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/08/15 18:09 upstream 15ef2f78c49d 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mmc_free_host
2026/09/03 04:22 linux-next 32b6ef9a5d0e 85995287 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in mmc_free_host
* Struck through repros no longer work on HEAD.