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Fri, 06 Jun 2025 07:28:31 -0700 (PDT) Date: Fri, 06 Jun 2025 07:28:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6842fb0f.a00a0220.29ac89.0042.GAE@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in sys_unlinkat (3) From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pasha.tatashin@soleen.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 177724000D X-Stat-Signature: p4i1s6j3isk8hjm5xouh3ewsm573gupo X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1749220111-802067 X-HE-Meta: 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 VHbqzwfb V2bhHcsEfZ71mNWOIXYRCXSJb1iLbAAkar1hq7wqkHPDaThuQUaxu5d0OClSlKwvntar1fgVhl5V1mqNv0MDFTtKxZYG/1zGp75GJHXWx4VSw7vYbN4IUV9A/TFrucTGUZzRmnVG6gpp7QojMyQWGOO+8nt+FOI9/KE3va/M25m1PQFNUbvFxUJDovdX0bkDOCnm66yMWWuNcGa/TDh8lQc5clZk7BE3rnDOUTV2NuNR2G2ZFcmlTFYkuh9FCyp8xDYZtycj/foj7PZQzHO3fJeWg7c7wHOa/nDE+n/oKkAJS6CFD8ae9IZo7lx6mn3/rFgCz4DyhEoPFxG6/GlQYxPVQqxFD6fVqyA1Khanvqx7grg50/atSCBl+M2Dg3FQooXc2cVxHlgkcfGGeBUbvSEhsuY/bC/bCSjKPdtxMZnIquLfYRg+VZdR73fzJyIV+/n9Be6dOArM+kmHuzBLVmIV6FqLpadj9myuIXhpaHEdYDqYk1+H8c4Elw0qxQtQiBl8U8SLxTJaowIaSGK5D/jP7H1Vv5OWSSn609e5l7H5r8/phS7zsicR2JB6Me0Tp/XJtmHhM2TPIIZ1tKO6qakwKEl6h9cfSIdnNSiukLoG9y/yyhklN1uawx+AHgWnvxfae0ySIUTqo5MUUQOOlnX1HfozkhN8h/BvBwWQQT3cvE68iHHofinn805DP3OLaXl3hb3vTFL9depghbGPIxPp1treFNjwXOmznt5ZSGbq/3eQWGT78nOmPrrCnnQ8LsehlsTnQGSGsxkvL+0oLhpVPfW4a1nvZZy1LzobHuoJvCf9DMJwDES2LqNtcHP2oWvXxICkuk4XffYbXeRrAqr5Vs7iwacjBVQWgShfeHVpGVQb4bgfjvq0VPwWRoJ1dnKuvzIFDwwzj+CwlRn3dLw+3SYZyEhrIc75dROD8Uxi6o7t3IHpLjDSIFIODYFIqXdxm74tmZIqE97wfLxPxCc0xh/WA 2gOei7bW 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 92a09c47464d Linux 6.15-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=143530f4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=91c351a0f6229e67 dashboard link: https://syzkaller.appspot.com/bug?extid=61ec37db8c428baeb677 compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1891731f8dec/disk-92a09c47.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d0de4fa2c8c2/vmlinux-92a09c47.xz kernel image: https://storage.googleapis.com/syzbot-assets/53a4edfaecf1/bzImage-92a09c47.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+61ec37db8c428baeb677@syzkaller.appspotmail.com sched: DL replenish lagged too much rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6265/1:b..l rcu: (detected by 0, t=10503 jiffies, g=19425, q=859 ncpus=2) task:syz-executor state:R running task stack:22008 pid:6265 tgid:6265 ppid:6251 task_flags:0x400140 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7090 irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline] RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] RIP: 0010:__page_table_check_zero+0x1f9/0x510 mm/page_table_check.c:142 Code: 89 ee e8 fa 26 93 ff 4c 39 ed 0f 84 6c 01 00 00 4c 8b 3d 5a 2c db 0b 4d 01 e7 4c 89 ff be 04 00 00 00 e8 7a 1b f5 ff 4c 89 f8 <48> c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 RSP: 0018:ffffc9000b5ef790 EFLAGS: 00000256 RAX: ffff88801d1b29b8 RBX: 0000000000000000 RCX: ffffffff822cabd6 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88801d1b29b8 RBP: 0000000000000008 R08: ffff88801d1b29bb R09: 1ffff11003a36537 R10: dffffc0000000000 R11: ffffed1003a36538 R12: ffff88801d1b2970 R13: 0000000000000003 R14: 000000000005d6e9 R15: ffff88801d1b29b8 page_table_check_free include/linux/page_table_check.h:41 [inline] free_pages_prepare mm/page_alloc.c:1263 [inline] __free_frozen_pages+0xb22/0xcd0 mm/page_alloc.c:2725 __slab_free+0x326/0x400 mm/slub.c:4553 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:385 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4339 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x28b/0x550 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x58d/0x5d0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x213/0x4b0 security/tomoyo/file.c:822 tomoyo_path_rmdir+0xa2/0xe0 security/tomoyo/tomoyo.c:195 security_path_rmdir+0x167/0x360 security/security.c:1949 do_rmdir+0x219/0x630 fs/namei.c:4506 __do_sys_unlinkat fs/namei.c:4683 [inline] __se_sys_unlinkat fs/namei.c:4677 [inline] __x64_sys_unlinkat+0xc2/0xf0 fs/namei.c:4677 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f36e318df47 RSP: 002b:00007ffdf6aecb78 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f36e318df47 RDX: 0000000000000200 RSI: 00007ffdf6aedd20 RDI: 00000000ffffff9c RBP: 00007f36e321089d R08: 000055555c96962b R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000207 R12: 00007ffdf6aedd20 R13: 00007f36e321089d R14: 0000000000033668 R15: 00007ffdf6aeedf0 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup