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Fri, 26 Jun 2026 14:28:00 -0700 (PDT) Message-ID: <6a3eeee0.90b0dd93.20279d.5780@mx.google.com> Date: Fri, 26 Jun 2026 14:28:00 -0700 (PDT) Subject: WARNING in shmem_evict_inode To: hughd@google.com, baolin.wang@linux.alibaba.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: syzkaller@googlegroups.com, contact@pgazz.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: sanan.hasanou@gmail.com Good day, dear maintainers, We found a bug using a modified version of syzkaller. Kernel Branch: 7.0-rc1 Kernel Config: Unfortunately, we don't have any reproducer for this bug yet. Thank you! Best regards, Sanan Hasanov ------------[ cut here ]------------ inode->i_blocks WARNING: mm/shmem.c:1430 at shmem_evict_inode+0x9d2/0xa30 mm/shmem.c:1430, CPU#0: syz.2.443/13891 Modules linked in: CPU: 0 UID: 0 PID: 13891 Comm: syz.2.443 Not tainted 7.0.0-rc1 #1 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:shmem_evict_inode+0x9d2/0xa30 mm/shmem.c:1430 Code: 0e 48 3b 84 24 00 01 00 00 75 24 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 59 28 b8 ff e9 43 fe ff ff e8 4f 28 b8 ff 90 <0f> 0b 90 eb 9a e8 24 4f 16 09 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c RSP: 0018:ffffc9000b8ff680 EFLAGS: 00010293 RAX: ffffffff82056871 RBX: 0000000000000008 RCX: ffff88801b71d700 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 RBP: ffffc9000b8ff7d0 R08: ffffffff8da5a1a3 R09: 1ffffffff1b4b434 R10: dffffc0000000000 R11: fffffbfff1b4b435 R12: ffff88804b899ae8 R13: ffff88804b8999f0 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30924220 CR3: 000000000d74a000 CR4: 00000000000006f0 Call Trace: evict+0x5ed/0xad0 fs/inode.c:846 __dentry_kill+0x198/0x5d0 fs/dcache.c:670 finish_dput+0xc9/0x480 fs/dcache.c:879 __fput+0x688/0xa60 fs/file_table.c:477 task_work_run+0x1ce/0x250 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x694/0x22f0 kernel/exit.c:971 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112 get_signal+0x1280/0x1330 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x640 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x33b/0xfc0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7fd265fa3b6d Code: Unable to access opcode bytes at 0x7fd265fa3b43. RSP: 002b:00007fd266d8a0d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fd266216188 RCX: 00007fd265fa3b6d RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd266216188 RBP: 00007fd266216180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd266216218 R14: 000000000000006e R15: 00007ffcd73a64f0 <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>> Modules linked in: CPU: 0 UID: 0 PID: 13891 Comm: syz.2.443 Not tainted 7.0.0-rc1 #1 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:shmem_evict_inode+0x9d2/0xa30 Code: 0e 48 3b 84 24 00 01 00 00 75 24 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 59 28 b8 ff e9 43 fe ff ff e8 4f 28 b8 ff 90 <0f> 0b 90 eb 9a e8 24 4f 16 09 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c RSP: 0018:ffffc9000b8ff680 EFLAGS: 00010293 RAX: ffffffff82056871 RBX: 0000000000000008 RCX: ffff88801b71d700 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 RBP: ffffc9000b8ff7d0 R08: ffffffff8da5a1a3 R09: 1ffffffff1b4b434 R10: dffffc0000000000 R11: fffffbfff1b4b435 R12: ffff88804b899ae8 R13: ffff88804b8999f0 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30924220 CR3: 000000000d74a000 CR4: 00000000000006f0 Call Trace: evict+0x5ed/0xad0 __dentry_kill+0x198/0x5d0 finish_dput+0xc9/0x480 __fput+0x688/0xa60 task_work_run+0x1ce/0x250 do_exit+0x694/0x22f0 do_group_exit+0x21c/0x2d0 get_signal+0x1280/0x1330 arch_do_signal_or_restart+0x9a/0x640 exit_to_user_mode_loop+0x87/0x4e0 do_syscall_64+0x33b/0xfc0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7fd265fa3b6d Code: Unable to access opcode bytes at 0x7fd265fa3b43. RSP: 002b:00007fd266d8a0d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fd266216188 RCX: 00007fd265fa3b6d RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd266216188 RBP: 00007fd266216180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd266216218 R14: 000000000000006e R15: 00007ffcd73a64f0 Kernel panic - not syncing: kernel: panic_on_warn set ... CPU: 0 UID: 0 PID: 13891 Comm: syz.2.443 Not tainted 7.0.0-rc1 #1 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: vpanic+0x41f/0xa30 panic+0xb9/0xc0 __warn+0x317/0x500 __report_bug+0x28d/0x500 report_bug+0x16a/0x220 handle_bug+0x98/0x200 exc_invalid_op+0x1a/0x50 asm_exc_invalid_op+0x1a/0x20 RIP: 0010:shmem_evict_inode+0x9d2/0xa30 Code: 0e 48 3b 84 24 00 01 00 00 75 24 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 59 28 b8 ff e9 43 fe ff ff e8 4f 28 b8 ff 90 <0f> 0b 90 eb 9a e8 24 4f 16 09 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c RSP: 0018:ffffc9000b8ff680 EFLAGS: 00010293 RAX: ffffffff82056871 RBX: 0000000000000008 RCX: ffff88801b71d700 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 RBP: ffffc9000b8ff7d0 R08: ffffffff8da5a1a3 R09: 1ffffffff1b4b434 R10: dffffc0000000000 R11: fffffbfff1b4b435 R12: ffff88804b899ae8 R13: ffff88804b8999f0 R14: 0000000000000000 R15: 0000000000000000 evict+0x5ed/0xad0 __dentry_kill+0x198/0x5d0 finish_dput+0xc9/0x480 __fput+0x688/0xa60 task_work_run+0x1ce/0x250 do_exit+0x694/0x22f0 do_group_exit+0x21c/0x2d0 get_signal+0x1280/0x1330 arch_do_signal_or_restart+0x9a/0x640 exit_to_user_mode_loop+0x87/0x4e0 do_syscall_64+0x33b/0xfc0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7fd265fa3b6d Code: Unable to access opcode bytes at 0x7fd265fa3b43. RSP: 002b:00007fd266d8a0d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fd266216188 RCX: 00007fd265fa3b6d RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd266216188 RBP: 00007fd266216180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd266216218 R14: 000000000000006e R15: 00007ffcd73a64f0 Kernel Offset: disabled Rebooting in 86400 seconds.. <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>