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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3312:b0:3dc:8b57:b750 with SMTP id e9e14a558f8ab-3e2543c1cccmr93185195ab.17.1752393843427; Sun, 13 Jul 2025 01:04:03 -0700 (PDT) Date: Sun, 13 Jul 2025 01:04:03 -0700 In-Reply-To: <20250713073854.3864-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68736873.a70a0220.3b380f.0026.GAE@google.com> Subject: Re: [syzbot] [lsm?] [net?] WARNING in kvfree_call_rcu From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in kvfree_call_rcu ------------[ cut here ]------------ ODEBUG: activate active (active state 1) object: 000000008ba27235 object type: rcu_head hint: 0x0 WARNING: CPU: 0 PID: 7508 at lib/debugobjects.c:615 debug_print_object lib/debugobjects.c:612 [inline] WARNING: CPU: 0 PID: 7508 at lib/debugobjects.c:615 debug_object_activate+0x344/0x460 lib/debugobjects.c:842 Modules linked in: CPU: 0 UID: 0 PID: 7508 Comm: syz.0.17 Not tainted 6.16.0-rc5-syzkaller-00067-gec4801305969-dirty #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:612 [inline] pc : debug_object_activate+0x344/0x460 lib/debugobjects.c:842 lr : debug_print_object lib/debugobjects.c:612 [inline] lr : debug_object_activate+0x344/0x460 lib/debugobjects.c:842 sp : ffff80009fa276d0 x29: ffff80009fa276d0 x28: ffff8000976d8000 x27: dfff800000000000 x26: ffff80008afc2440 x25: 0000000000000001 x24: ffff8000891ac400 x23: 0000000000000003 x22: ffff80008b5399e0 x21: 0000000000000000 x20: ffff80008afc2440 x19: ffff8000891ac400 x18: 0000000000000000 x17: 3332373261623830 x16: ffff80008aefc4a8 x15: 0000000000000001 x14: 1fffe000337d40e2 x13: 0000000000000000 x12: 0000000000000000 x11: ffff6000337d40e3 x10: 0000000000ff0100 x9 : 18e87d931bcbd000 x8 : 18e87d931bcbd000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80009fa27018 x4 : ffff80008f766be0 x3 : ffff8000807bcfac x2 : 0000000000000001 x1 : 0000000100000201 x0 : 0000000000000000 Call trace: debug_print_object lib/debugobjects.c:612 [inline] (P) debug_object_activate+0x344/0x460 lib/debugobjects.c:842 (P) debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline] kvfree_call_rcu+0x4c/0x3f0 mm/slab_common.c:1953 cipso_v4_sock_setattr+0x2f0/0x3f4 net/ipv4/cipso_ipv4.c:1914 netlbl_sock_setattr+0x240/0x334 net/netlabel/netlabel_kapi.c:1000 smack_netlbl_add+0xa8/0x158 security/smack/smack_lsm.c:2581 smack_inode_setsecurity+0x378/0x430 security/smack/smack_lsm.c:2912 security_inode_setsecurity+0x118/0x3c0 security/security.c:2706 __vfs_setxattr_noperm+0x174/0x5c4 fs/xattr.c:251 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295 vfs_setxattr+0x158/0x2ac fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] file_setxattr+0x1b8/0x294 fs/xattr.c:646 path_setxattrat+0x2ac/0x320 fs/xattr.c:711 __do_sys_fsetxattr fs/xattr.c:761 [inline] __se_sys_fsetxattr fs/xattr.c:758 [inline] __arm64_sys_fsetxattr+0xc0/0xdc fs/xattr.c:758 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 187 hardirqs last enabled at (186): [] __up_console_sem kernel/printk/printk.c:344 [inline] hardirqs last enabled at (186): [] __console_unlock+0x70/0xc4 kernel/printk/printk.c:2885 hardirqs last disabled at (187): [] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574 softirqs last enabled at (142): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (158): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ ODEBUG: active_state active (active state 1) object: 000000008ba27235 object type: rcu_head hint: 0x0 WARNING: CPU: 0 PID: 7508 at lib/debugobjects.c:615 debug_print_object lib/debugobjects.c:612 [inline] WARNING: CPU: 0 PID: 7508 at lib/debugobjects.c:615 debug_object_active_state+0x28c/0x350 lib/debugobjects.c:1064 Modules linked in: CPU: 0 UID: 0 PID: 7508 Comm: syz.0.17 Tainted: G W 6.16.0-rc5-syzkaller-00067-gec4801305969-dirty #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:612 [inline] pc : debug_object_active_state+0x28c/0x350 lib/debugobjects.c:1064 lr : debug_print_object lib/debugobjects.c:612 [inline] lr : debug_object_active_state+0x28c/0x350 lib/debugobjects.c:1064 sp : ffff80009fa276c0 x29: ffff80009fa276d0 x28: ffff80008f671000 x27: dfff800000000000 x26: 0000000000000003 x25: 0000000000000000 x24: ffff0000ec001738 x23: 0000000000000001 x22: ffff80008afc2440 x21: ffff80008b5399e0 x20: 0000000000000000 x19: ffff8000891ac400 x18: 0000000000000000 x17: 6162383030303030 x16: ffff80008ae63d48 x15: ffff700011ede144 x14: 1ffff00011ede144 x13: 0000000000000004 x12: ffffffffffffffff x11: ffff700011ede144 x10: 0000000000ff0100 x9 : 18e87d931bcbd000 x8 : 18e87d931bcbd000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80009fa27018 x4 : ffff80008f766be0 x3 : ffff80008054d314 x2 : 0000000000000000 x1 : 0000000000000201 x0 : 0000000000000000 Call trace: debug_print_object lib/debugobjects.c:612 [inline] (P) debug_object_active_state+0x28c/0x350 lib/debugobjects.c:1064 (P) debug_rcu_head_queue kernel/rcu/rcu.h:237 [inline] kvfree_call_rcu+0x64/0x3f0 mm/slab_common.c:1953 cipso_v4_sock_setattr+0x2f0/0x3f4 net/ipv4/cipso_ipv4.c:1914 netlbl_sock_setattr+0x240/0x334 net/netlabel/netlabel_kapi.c:1000 smack_netlbl_add+0xa8/0x158 security/smack/smack_lsm.c:2581 smack_inode_setsecurity+0x378/0x430 security/smack/smack_lsm.c:2912 security_inode_setsecurity+0x118/0x3c0 security/security.c:2706 __vfs_setxattr_noperm+0x174/0x5c4 fs/xattr.c:251 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295 vfs_setxattr+0x158/0x2ac fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] file_setxattr+0x1b8/0x294 fs/xattr.c:646 path_setxattrat+0x2ac/0x320 fs/xattr.c:711 __do_sys_fsetxattr fs/xattr.c:761 [inline] __se_sys_fsetxattr fs/xattr.c:758 [inline] __arm64_sys_fsetxattr+0xc0/0xdc fs/xattr.c:758 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 215 hardirqs last enabled at (214): [] __up_console_sem kernel/printk/printk.c:344 [inline] hardirqs last enabled at (214): [] __console_unlock+0x70/0xc4 kernel/printk/printk.c:2885 hardirqs last disabled at (215): [] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574 softirqs last enabled at (142): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (158): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ kvfree_call_rcu(): Double-freed call. rcu_head 000000008ba27235 WARNING: CPU: 0 PID: 7508 at mm/slab_common.c:1956 kvfree_call_rcu+0x94/0x3f0 mm/slab_common.c:1955 Modules linked in: CPU: 0 UID: 0 PID: 7508 Comm: syz.0.17 Tainted: G W 6.16.0-rc5-syzkaller-00067-gec4801305969-dirty #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : kvfree_call_rcu+0x94/0x3f0 mm/slab_common.c:1955 lr : kvfree_call_rcu+0x94/0x3f0 mm/slab_common.c:1955 sp : ffff80009fa27730 x29: ffff80009fa27730 x28: 00000000fffffff5 x27: 1fffe00018b140b3 x26: dfff800000000000 x25: ffff0000dcf6936e x24: 0000000000000017 x23: ffff8000891ac400 x22: 00000000ffffffea x21: ffff8000891ac400 x20: ffff8000891ac400 x19: ffff80008afc2440 x18: 0000000000000000 x17: 0000000000000000 x16: ffff80008ae63d48 x15: ffff700011ede144 x14: 1ffff00011ede144 x13: 0000000000000004 x12: ffffffffffffffff x11: ffff700011ede144 x10: 0000000000ff0100 x9 : 18e87d931bcbd000 x8 : 18e87d931bcbd000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80009fa27078 x4 : ffff80008f766be0 x3 : ffff80008054d314 x2 : 0000000000000000 x1 : 0000000000000201 x0 : 0000000000000000 Call trace: kvfree_call_rcu+0x94/0x3f0 mm/slab_common.c:1955 (P) cipso_v4_sock_setattr+0x2f0/0x3f4 net/ipv4/cipso_ipv4.c:1914 netlbl_sock_setattr+0x240/0x334 net/netlabel/netlabel_kapi.c:1000 smack_netlbl_add+0xa8/0x158 security/smack/smack_lsm.c:2581 smack_inode_setsecurity+0x378/0x430 security/smack/smack_lsm.c:2912 security_inode_setsecurity+0x118/0x3c0 security/security.c:2706 __vfs_setxattr_noperm+0x174/0x5c4 fs/xattr.c:251 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295 vfs_setxattr+0x158/0x2ac fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] file_setxattr+0x1b8/0x294 fs/xattr.c:646 path_setxattrat+0x2ac/0x320 fs/xattr.c:711 __do_sys_fsetxattr fs/xattr.c:761 [inline] __se_sys_fsetxattr fs/xattr.c:758 [inline] __arm64_sys_fsetxattr+0xc0/0xdc fs/xattr.c:758 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 239 hardirqs last enabled at (238): [] __up_console_sem kernel/printk/printk.c:344 [inline] hardirqs last enabled at (238): [] __console_unlock+0x70/0xc4 kernel/printk/printk.c:2885 hardirqs last disabled at (239): [] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574 softirqs last enabled at (142): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (158): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- Tested on: commit: ec480130 Merge branches 'for-next/core' and 'for-next/.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=1799018c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9e99b6fcd403d050 dashboard link: https://syzkaller.appspot.com/bug?extid=40bf00346c3fe40f90f2 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 userspace arch: arm64 patch: https://syzkaller.appspot.com/x/patch.diff?x=123a07d4580000