ci2 starts bisection 2025-06-07 14:13:03.61191558 +0000 UTC m=+43819.526620446
bisecting fixing commit since fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df
building syzkaller on e28266709dd2a1d1452d4a5bbf271700e10335c6
ensuring issue is reproducible on original commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df

testing commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: ada9086baae7a4c4fec766691744ac067aaab90a962d95e47b00d82ccccd5f2a
run #0: crashed: KASAN: use-after-free Read in ext4_find_extent
run #1: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #2: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #3: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #4: crashed: KASAN: use-after-free Read in ext4_find_extent
run #5: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #6: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #7: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #8: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #9: crashed: KASAN: use-after-free Read in ext4_find_extent
run #10: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #11: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #12: crashed: KASAN: use-after-free Read in ext4_find_extent
run #13: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #14: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #15: crashed: KASAN: use-after-free Read in ext4_find_extent
run #16: crashed: KASAN: use-after-free Read in ext4_find_extent
run #17: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #18: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #19: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
representative crash: KASAN: use-after-free Read in ext4_find_extent, types: [KASAN]
check whether we can drop unnecessary instrumentation
disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed
testing commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: c7b3c010706a854adc9cee41baa55f69c99d35f02349d7ac32edad80c8d10f86
run #0: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #1: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #2: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #3: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #4: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #5: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #6: crashed: KASAN: use-after-free Read in ext4_find_extent
run #7: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #8: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #9: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
representative crash: KASAN: use-after-free Write in ext4_ext_remove_space, types: [KASAN]
the bug reproduces without the instrumentation
disabling configs for [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed
kconfig minimization: base=4788 full=6023 leaves diff=246
split chunks (needed=false): <246>
split chunk #0 of len 246 into 5 parts
testing without sub-chunk 1/5
disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed
testing commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 053adc9b0b16ac60aa29f0db1fcb8144a67be1f3c0ce851b505de7098e871e22
run #0: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #1: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #2: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #3: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #4: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #5: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #6: crashed: KASAN: out-of-bounds Read in ext4_ext_insert_extent
run #7: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #8: crashed: KASAN: out-of-bounds Read in ext4_ext_insert_extent
run #9: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
representative crash: KASAN: use-after-free Read in ext4_ext_insert_extent, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG LOCKDEP], they are not needed
testing commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: a3f96964cbe1720ea40d3b4297c5a9a788e3cf3eefb750acadde16c9d28f5e75
run #0: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #1: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #2: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #3: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #4: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #5: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #6: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #7: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #8: crashed: panic: runtime error: invalid memory address or nil pointer dereference
run #9: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
representative crash: KASAN: use-after-free Write in ext4_ext_remove_space, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG], they are not needed
testing commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: ab07d91c78537a13ba2ff39145755cea0c611cb65ff4d09aa8f295c2b8b33f05
run #0: crashed: KASAN: out-of-bounds Write in ext4_ext_remove_space
run #1: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #2: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #3: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #4: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #5: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #6: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #7: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #8: crashed: KASAN: use-after-free Read in ext4_find_extent
run #9: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
representative crash: KASAN: out-of-bounds Write in ext4_ext_remove_space, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed
testing commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: e809b9abeb10348554c6378962c8baff3ae3a49f97dc15843b16e894131d9bf3
run #0: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #1: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #2: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #3: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #4: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #5: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #6: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #7: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #8: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #9: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
representative crash: KASAN: use-after-free Write in ext4_ext_remove_space, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed
testing commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
failed building fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df: net/socket.c:1128: undefined reference to `wext_handle_ioctl'
net/socket.c:3397: undefined reference to `compat_wext_handle_ioctl'
net/core/net-procfs.c:346: undefined reference to `wext_proc_exit'
net/core/net-procfs.c:330: undefined reference to `wext_proc_init'
minimized to 46 configs; suspects: [HID_ZEROPLUS USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_RNDIS_HOST USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD USB_OHCI_HCD_PCI USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_PRINTER USB_SERIAL USB_SERIAL_FTDI_SIO USB_SERIAL_GENERIC USB_SERIAL_PL2303 USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_TRANCEVIBRATOR USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_WDM USB_XHCI_PCI_RENESAS WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_ZYDAS X86_X32 ZEROPLUS_FF]
disabling configs for [LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG], they are not needed
testing current HEAD d76d4cd0623a12e7a5512e26fee809feb445b26b
testing commit d76d4cd0623a12e7a5512e26fee809feb445b26b gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 547db26153708bc8724bc1ec4248444c3d94647610027f94a1800899b9f35976
run #0: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #1: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #2: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #3: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #4: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #5: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #6: crashed: KASAN: use-after-free Read in ext4_ext_remove_space
run #7: crashed: KASAN: use-after-free Write in ext4_ext_remove_space
run #8: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
run #9: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent
representative crash: KASAN: use-after-free Read in ext4_ext_remove_space, types: [KASAN]
crash still not fixed/happens on the oldest tested release
revisions tested: 7, total time: 1h35m22.338150748s (build: 54m50.93918288s, test: 38m56.721613643s)
crash still not fixed or there were kernel test errors
commit msg: Revert "ipv6: save dontfrag in cork"
crash: KASAN: use-after-free Read in ext4_ext_remove_space
EXT4-fs error (device loop3): ext4_ext_split:1142: inode #17: comm syz.3.19: eh_entries 49867 != eh_max 28613!
==================================================================
BUG: KASAN: use-after-free in ext4_ext_rm_leaf fs/ext4/extents.c:2594 [inline]
BUG: KASAN: use-after-free in ext4_ext_remove_space+0x3c08/0x3c70 fs/ext4/extents.c:2932
Read of size 4 at addr ffff88812bd0ed84 by task syz.3.19/570

CPU: 1 PID: 570 Comm: syz.3.19 Not tainted 5.10.238-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x81/0xac lib/dump_stack.c:118
 print_address_description.constprop.0+0x24/0x160 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report.cold+0x82/0xdb mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_ext_rm_leaf fs/ext4/extents.c:2594 [inline]
 ext4_ext_remove_space+0x3c08/0x3c70 fs/ext4/extents.c:2932
 ext4_ext_truncate+0x168/0x1c0 fs/ext4/extents.c:4465
 ext4_truncate+0x955/0xff0 fs/ext4/inode.c:4367
 ext4_truncate_failed_write fs/ext4/truncate.h:20 [inline]
 ext4_write_begin+0x88e/0xf00 fs/ext4/inode.c:1276
 ext4_da_write_begin+0x52b/0xc30 fs/ext4/inode.c:3033
 generic_perform_write+0x202/0x4a0 mm/filemap.c:3509
 ext4_buffered_write_iter+0x1e5/0x420 fs/ext4/file.c:271
 ext4_file_write_iter+0x358/0x18e0 fs/ext4/file.c:685
 call_write_iter include/linux/fs.h:2058 [inline]
 new_sync_write+0x358/0x6d0 fs/read_write.c:518
 vfs_write+0x4e4/0x750 fs/read_write.c:605
 ksys_write+0x111/0x210 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x6e/0xb0 fs/read_write.c:667
 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f5ec52d8169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5ec4d29038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5ec54f1080 RCX: 00007f5ec52d8169
RDX: 00000000002a979d RSI: 0000400000000000 RDI: 0000000000000004
RBP: 00007f5ec53592a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5ec54f1080 R15: 00007fff2c0cf4d8

The buggy address belongs to the page:
page:ffffea0004af4380 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12bd0e
flags: 0x4000000000000000()
raw: 4000000000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff888126ac4000
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x8100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|0x8000000), pid 559, ts 74148072562, free_ts 73698920781
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page mm/page_alloc.c:2462 [inline]
 get_page_from_freelist+0x1fee/0x2ad0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x2ae/0x2490 mm/page_alloc.c:5357
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 do_anonymous_page mm/memory.c:3963 [inline]
 handle_pte_fault+0x1672/0x3210 mm/memory.c:4786
 __handle_mm_fault+0xac7/0xfa0 mm/memory.c:4944
 handle_mm_fault+0x1b8/0x6b0 mm/memory.c:5358
 do_user_addr_fault+0x4d0/0xa20 arch/x86/mm/fault.c:1362
 handle_page_fault arch/x86/mm/fault.c:1428 [inline]
 exc_page_fault+0x65/0xc0 arch/x86/mm/fault.c:1484
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare+0x1a7/0x230 mm/page_alloc.c:1421
 free_unref_page_prepare mm/page_alloc.c:3336 [inline]
 free_unref_page_list+0x18a/0xae0 mm/page_alloc.c:3443
 release_pages+0x374/0xb00 mm/swap.c:1103
 free_pages_and_swap_cache+0x180/0x1e0 mm/swap_state.c:356
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x129/0x790 mm/mmu_gather.c:326
 exit_mmap+0x296/0x520 mm/mmap.c:3375
 __mmput kernel/fork.c:1153 [inline]
 mmput kernel/fork.c:1176 [inline]
 mmput+0x99/0x430 kernel/fork.c:1170
 exit_mm kernel/exit.c:539 [inline]
 do_exit+0x86b/0x2330 kernel/exit.c:850
 do_group_exit+0xe6/0x290 kernel/exit.c:985
 get_signal+0x353/0x1a10 kernel/signal.c:2793
 arch_do_signal_or_restart+0x2ad/0x2510 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
 exit_to_user_mode_prepare+0xd1/0x120 kernel/entry/common.c:199
 syscall_exit_to_user_mode+0x27/0x160 kernel/entry/common.c:274
 do_syscall_64+0x3f/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff88812bd0ec80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812bd0ed00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812bd0ed80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffff88812bd0ee00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812bd0ee80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
EXT4-fs error (device loop3): ext4_free_blocks:5684: comm syz.3.19: Freeing blocks not in datazone - block = 124760464460638, count = 14493
EXT4-fs error (device loop3): ext4_free_blocks:5684: comm syz.3.19: Freeing blocks not in datazone - block = 210914857427993, count = 56
EXT4-fs error (device loop3): ext4_free_blocks:5684: comm syz.3.19: Freeing blocks not in datazone - block = 90038373278315, count = 4829
EXT4-fs error (device loop3): ext4_free_blocks:5684: comm syz.3.19: Freeing blocks not in datazone - block = 273539867269873, count = 18423
EXT4-fs error (device loop3): ext4_free_blocks:5684: comm syz.3.19: Freeing blocks not in datazone - block = 152796993378416, count = 21320
EXT4-fs error (device loop3): ext4_free_blocks:5684: comm syz.3.19: Freeing blocks not in datazone - block = 129713374391913, count = 22569
EXT4-fs error (device loop3): ext4_free_blocks:5684: comm syz.3.19: Freeing blocks not in datazone - block = 250620496922177, count = 18810
EXT4-fs error (device loop3): ext4_free_blocks:5684: comm syz.3.19: Freeing blocks not in datazone - block = 107513566095158, count = 12905
EXT4-fs error (device loop3): ext4_free_blocks:5684: comm syz.3.19: Freeing blocks not in datazone - block = 207163542470786, count = 15612