------------[ cut here ]------------
WARNING: CPU: 1 PID: 6182 at lib/refcount.c:28 refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28
refcount_t: underflow; use-after-free.
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 1 UID: 0 PID: 6182 Comm: kworker/u9:4 Not tainted 6.11.0-syzkaller #0
Hardware name: ARM-Versatile Express
Call trace: frame pointer underflow
[<8198c4e0>] (dump_backtrace) from [<8198c5dc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:826228c4 r5:00000000 r4:820390a8
[<8198c5c4>] (show_stack) from [<819aa8c4>] (__dump_stack lib/dump_stack.c:93 [inline])
[<8198c5c4>] (show_stack) from [<819aa8c4>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:119)
[<819aa870>] (dump_stack_lvl) from [<819aa904>] (dump_stack+0x18/0x1c lib/dump_stack.c:128)
 r5:00000000 r4:82870d18
[<819aa8ec>] (dump_stack) from [<8198d108>] (panic+0x120/0x374 kernel/panic.c:354)
[<8198cfe8>] (panic) from [<802421dc>] (check_panic_on_warn kernel/panic.c:243 [inline])
[<8198cfe8>] (panic) from [<802421dc>] (get_taint+0x0/0x1c kernel/panic.c:238)
 r3:8260c5c4 r2:00000001 r1:820210f0 r0:82028eb4
 r7:80839f38
[<80242168>] (check_panic_on_warn) from [<80242340>] (__warn+0x80/0x188 kernel/panic.c:748)
[<802422c0>] (__warn) from [<80242630>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:783)
 r8:00000009 r7:82087dc4 r6:df805c64 r5:82ff3c00 r4:00000000
[<8024244c>] (warn_slowpath_fmt) from [<80839f38>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:20000113 r9:84bdbf5c r8:845c63c0 r7:00000000 r6:8181ca34 r5:00000002
 r4:845c63c0
[<80839dfc>] (refcount_warn_saturate) from [<8148cd70>] (__refcount_sub_and_test include/linux/refcount.h:275 [inline])
[<80839dfc>] (refcount_warn_saturate) from [<8148cd70>] (__refcount_dec_and_test include/linux/refcount.h:307 [inline])
[<80839dfc>] (refcount_warn_saturate) from [<8148cd70>] (refcount_dec_and_test include/linux/refcount.h:325 [inline])
[<80839dfc>] (refcount_warn_saturate) from [<8148cd70>] (skb_unref include/linux/skbuff.h:1232 [inline])
[<80839dfc>] (refcount_warn_saturate) from [<8148cd70>] (__sk_skb_reason_drop net/core/skbuff.c:1213 [inline])
[<80839dfc>] (refcount_warn_saturate) from [<8148cd70>] (sk_skb_reason_drop+0x1d8/0x248 net/core/skbuff.c:1241)
[<8148cb98>] (sk_skb_reason_drop) from [<8181ca34>] (kfree_skb_reason include/linux/skbuff.h:1262 [inline])
[<8148cb98>] (sk_skb_reason_drop) from [<8181ca34>] (kfree_skb include/linux/skbuff.h:1271 [inline])
[<8148cb98>] (sk_skb_reason_drop) from [<8181ca34>] (j1939_session_skb_drop_old net/can/j1939/transport.c:347 [inline])
[<8148cb98>] (sk_skb_reason_drop) from [<8181ca34>] (j1939_xtp_rx_cts_one net/can/j1939/transport.c:1445 [inline])
[<8148cb98>] (sk_skb_reason_drop) from [<8181ca34>] (j1939_xtp_rx_cts+0x220/0x3d0 net/can/j1939/transport.c:1484)
 r9:84bdbf5c r8:845c63c0 r7:834426d8 r6:00000df2 r5:84bdbf00 r4:84bdbf14
[<8181c814>] (j1939_xtp_rx_cts) from [<8181d9a8>] (j1939_tp_cmd_recv net/can/j1939/transport.c:2089 [inline])
[<8181c814>] (j1939_xtp_rx_cts) from [<8181d9a8>] (j1939_tp_recv+0x3f4/0x530 net/can/j1939/transport.c:2161)
 r10:ddde50c8 r9:00000040 r8:834426d0 r7:851a5000 r6:851a5008 r5:851a5000
 r4:853263c0
[<8181d5b4>] (j1939_tp_recv) from [<81817440>] (j1939_can_recv+0x1e4/0x2dc net/can/j1939/main.c:108)
 r7:851a5000 r6:851a5008 r5:851a5810 r4:853263c0
[<8181725c>] (j1939_can_recv) from [<8180d20c>] (deliver net/can/af_can.c:572 [inline])
[<8181725c>] (j1939_can_recv) from [<8180d20c>] (can_rcv_filter+0x9c/0x218 net/can/af_can.c:606)
 r9:00000040 r8:84a9c680 r7:98c80000 r6:85326300 r5:00000001 r4:84b65480
[<8180d170>] (can_rcv_filter) from [<8180dbb0>] (can_receive+0xb4/0xf0 net/can/af_can.c:663)
 r9:00000040 r8:00000000 r7:84a9c000 r6:84435080 r5:845a8000 r4:85326300
[<8180dafc>] (can_receive) from [<8180dc70>] (can_rcv+0x84/0xac net/can/af_can.c:687)
 r9:00000040 r8:00000001 r7:00000000 r6:00000000 r5:8180dbec r4:85326300
[<8180dbec>] (can_rcv) from [<814adbe8>] (__netif_receive_skb_one_core+0x5c/0x80 net/core/dev.c:5662)
 r5:8180dbec r4:84a9c000
[<814adb8c>] (__netif_receive_skb_one_core) from [<814adc54>] (__netif_receive_skb+0x18/0x5c net/core/dev.c:5775)
 r5:ddde51b0 r4:85326300
[<814adc3c>] (__netif_receive_skb) from [<814adf44>] (process_backlog+0x88/0x15c net/core/dev.c:6107)
 r5:ddde51b0 r4:85326300
[<814adebc>] (process_backlog) from [<814aee48>] (__napi_poll+0x34/0x240 net/core/dev.c:6771)
 r10:ddde50c0 r9:ddde5300 r8:df805ea0 r7:df805e9b r6:00000040 r5:ddde51b0
 r4:00000001
[<814aee14>] (__napi_poll) from [<814af680>] (napi_poll net/core/dev.c:6840 [inline])
[<814aee14>] (__napi_poll) from [<814af680>] (net_rx_action+0x338/0x420 net/core/dev.c:6962)
 r9:ddde5300 r8:df805ea0 r7:0000012c r6:00000865 r5:ddde51b0 r4:00000000
[<814af348>] (net_rx_action) from [<8024b5fc>] (handle_softirqs+0x158/0x464 kernel/softirq.c:554)
 r10:00000008 r9:82ff3c00 r8:00000102 r7:00048040 r6:00000003 r5:00000004
 r4:8260408c
[<8024b4a4>] (handle_softirqs) from [<8024b9f8>] (__do_softirq kernel/softirq.c:588 [inline])
[<8024b4a4>] (handle_softirqs) from [<8024b9f8>] (invoke_softirq kernel/softirq.c:428 [inline])
[<8024b4a4>] (handle_softirqs) from [<8024b9f8>] (__irq_exit_rcu+0xa4/0x164 kernel/softirq.c:637)
 r10:00000000 r9:82ff3c00 r8:00000000 r7:dfb819a8 r6:821da600 r5:8221ad84
 r4:82ff3c00
[<8024b954>] (__irq_exit_rcu) from [<8024bcf8>] (irq_exit+0x10/0x18 kernel/softirq.c:661)
 r5:8221ad84 r4:824bacdc
[<8024bce8>] (irq_exit) from [<819ab1c0>] (generic_handle_arch_irq+0x7c/0x80 kernel/irq/handle.c:240)
[<819ab144>] (generic_handle_arch_irq) from [<8195bed4>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40)
 r9:82ff3c00 r8:00000000 r7:dfb819dc r6:ffffffff r5:60000013 r4:8024bb18
[<8195beb8>] (call_with_stack) from [<80200bcc>] (__irq_svc+0x8c/0xbc arch/arm/kernel/entry-armv.S:227)
Exception stack(0xdfb819a8 to 0xdfb819f0)
19a0:                   00000001 00000006 00000000 00048040 60000013 00000002
19c0: dfb81a70 00000070 00000000 00000000 00000000 dfb81a0c df805f00 dfb819f8
19e0: 819abdfc 8024bb18 60000013 ffffffff
[<8024bab8>] (do_softirq) from [<8024bbe8>] (__local_bh_enable_ip+0xcc/0xd0 kernel/softirq.c:382)
 r5:00000002 r4:82ff3c00
[<8024bb1c>] (__local_bh_enable_ip) from [<802028b8>] (local_bh_enable include/linux/bottom_half.h:33 [inline])
[<8024bb1c>] (__local_bh_enable_ip) from [<802028b8>] (kernel_neon_end+0x24/0x2c arch/arm/vfp/vfpmodule.c:871)
 r5:84245e70 r4:0000000c
[<80202894>] (kernel_neon_end) from [<80239310>] (crc32c_pmull_update+0xbc/0xc0 arch/arm/crypto/crc32-ce-glue.c:161)
[<80239254>] (crc32c_pmull_update) from [<8076a9f8>] (crypto_shash_update+0x1c/0x20 crypto/shash.c:52)
 r7:83ead800 r6:84245e00 r5:83088640 r4:83088718
[<8076a9dc>] (crypto_shash_update) from [<806328b4>] (ext4_chksum fs/ext4/ext4.h:2479 [inline])
[<8076a9dc>] (crypto_shash_update) from [<806328b4>] (ext4_inode_csum+0x74/0x250 fs/ext4/inode.c:61)
[<80632840>] (ext4_inode_csum) from [<80632ae8>] (ext4_inode_csum_set fs/ext4/inode.c:115 [inline])
[<80632840>] (ext4_inode_csum) from [<80632ae8>] (ext4_inode_csum_set+0x58/0xe0 fs/ext4/inode.c:105)
 r7:83088640 r6:84245e00 r5:840d1800 r4:83088718
[<80632a90>] (ext4_inode_csum_set) from [<80632eb8>] (ext4_fill_raw_inode+0x348/0x410 fs/ext4/inode.c:4391)
 r7:00000000 r6:83088640 r5:84245e00 r4:83088718
[<80632b70>] (ext4_fill_raw_inode) from [<80637a08>] (ext4_do_update_inode fs/ext4/inode.c:5148 [inline])
[<80632b70>] (ext4_fill_raw_inode) from [<80637a08>] (ext4_mark_iloc_dirty+0xf0/0x4cc fs/ext4/inode.c:5778)
 r9:830da6c0 r8:84245000 r7:00000e00 r6:dfb81b74 r5:830888bc r4:83088718
[<80637918>] (ext4_mark_iloc_dirty) from [<80638108>] (__ext4_mark_inode_dirty+0x8c/0x278 fs/ext4/inode.c:5982)
 r10:00000020 r9:00000120 r8:8063d004 r7:00000000 r6:831f2270 r5:dfb81b74
 r4:83088718
[<8063807c>] (__ext4_mark_inode_dirty) from [<8063d004>] (ext4_dirty_inode+0x60/0x7c fs/ext4/inode.c:6011)
 r10:00000000 r9:00000120 r8:83088718 r7:840d1800 r6:82e9c790 r5:83088718
 r4:831f2270
[<8063cfa4>] (ext4_dirty_inode) from [<80552580>] (__mark_inode_dirty+0x54/0x558 fs/fs-writeback.c:2493)
 r5:00000008 r4:83088718
[<8055252c>] (__mark_inode_dirty) from [<80534148>] (generic_update_time+0x44/0x4c fs/inode.c:2049)
 r9:00000120 r8:83088718 r7:82ff3c00 r6:82e9c790 r5:83088718 r4:00000001
[<80534104>] (generic_update_time) from [<805366f0>] (inode_update_time fs/inode.c:2062 [inline])
[<80534104>] (generic_update_time) from [<805366f0>] (touch_atime+0x144/0x178 fs/inode.c:2134)
 r5:83088718 r4:00000001
[<805365ac>] (touch_atime) from [<8043cf34>] (file_accessed include/linux/fs.h:2527 [inline])
[<805365ac>] (touch_atime) from [<8043cf34>] (filemap_read+0x4b4/0x4bc mm/filemap.c:2693)
 r7:dfb81dd0 r6:851fc9c0 r5:00000120 r4:00000001
[<8043ca80>] (filemap_read) from [<8043d034>] (generic_file_read_iter+0xf8/0x130 mm/filemap.c:2813)
 r10:00001826 r9:00000120 r8:dfb81dd0 r7:dfb81db8 r6:00000000 r5:dfb81db8
 r4:00000000
[<8043cf3c>] (generic_file_read_iter) from [<8062289c>] (ext4_file_read_iter fs/ext4/file.c:147 [inline])
[<8043cf3c>] (generic_file_read_iter) from [<8062289c>] (ext4_file_read_iter+0x54/0x158 fs/ext4/file.c:130)
 r10:00001826 r9:00000000 r8:00000034 r7:dfb81e48 r6:00000000 r5:dfb81db8
 r4:dfb81dd0 r3:00000000
[<80622848>] (ext4_file_read_iter) from [<8050fc30>] (__kernel_read+0x164/0x328 fs/read_write.c:527)
 r9:00000000 r8:00000034 r7:dfb81e48 r6:00000000 r5:82ff3c00 r4:851fc9c0
[<8050facc>] (__kernel_read) from [<8050fe40>] (kernel_read+0x4c/0x50 fs/read_write.c:545)
 r9:828c7d10 r8:00000006 r7:83848600 r6:dfb81e48 r5:00000120 r4:851fc9c0
[<8050fdf4>] (kernel_read) from [<80595678>] (elf_read fs/binfmt_elf.c:470 [inline])
[<8050fdf4>] (kernel_read) from [<80595678>] (load_elf_phdrs+0x80/0xc4 fs/binfmt_elf.c:531)
 r7:851fc9c0 r6:00000120 r5:83848600 r4:83848a5c
[<805955f8>] (load_elf_phdrs) from [<80596ed4>] (load_elf_binary+0xcc/0x141c fs/binfmt_elf.c:855)
 r7:83848a5c r6:82ff3c00 r5:fffffff8 r4:83848a00
[<80596e08>] (load_elf_binary) from [<80518dd0>] (search_binary_handler fs/exec.c:1821 [inline])
[<80596e08>] (load_elf_binary) from [<80518dd0>] (exec_binprm fs/exec.c:1863 [inline])
[<80596e08>] (load_elf_binary) from [<80518dd0>] (bprm_execve fs/exec.c:1914 [inline])
[<80596e08>] (load_elf_binary) from [<80518dd0>] (bprm_execve+0x224/0x5ec fs/exec.c:1890)
 r10:00001826 r9:828c7d10 r8:00000006 r7:8271b52c r6:83848a00 r5:fffffff8
 r4:827207c4
[<80518bac>] (bprm_execve) from [<8051aa04>] (kernel_execve+0xf8/0x190 fs/exec.c:2081)
 r10:00000000 r9:00000000 r8:826f6050 r7:84419880 r6:82ed8000 r5:83848a00
 r4:00000000
[<8051a90c>] (kernel_execve) from [<8026066c>] (call_usermodehelper_exec_async+0xf0/0x160 kernel/umh.c:110)
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:850a5c80 r4:82f6ce00
[<8026057c>] (call_usermodehelper_exec_async) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfb81fb0 to 0xdfb81ff8)
1fa0:                                     00000000 00000000 00000000 00000000
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r7:00000000 r6:00000000 r5:8026057c r4:850a5c80
Rebooting in 86400 seconds..