bisecting cause commit starting from 28e8c4bc8eb483c22d977e147a0b98fc63efadf7 building syzkaller on 3d85f48c1449a8fe6db5cef827592f56ee6dcf26 testing commit 28e8c4bc8eb483c22d977e147a0b98fc63efadf7 with gcc (GCC) 8.1.0 run #0: crashed: WARNING: ODEBUG bug in netdev_freemem run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 all runs: OK # git bisect start 28e8c4bc8eb483c22d977e147a0b98fc63efadf7 v4.20 Bisecting: 4369 revisions left to test after this (roughly 12 steps) [e0c38a4d1f196a4b17d2eba36afff8f656a4f1de] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next testing commit e0c38a4d1f196a4b17d2eba36afff8f656a4f1de with gcc (GCC) 8.1.0 all runs: OK # git bisect good e0c38a4d1f196a4b17d2eba36afff8f656a4f1de Bisecting: 2196 revisions left to test after this (roughly 11 steps) [117eda8f71ff545cfdec8fe8073adbd173a1ceff] Merge tag 'tty-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty testing commit 117eda8f71ff545cfdec8fe8073adbd173a1ceff with gcc (GCC) 8.1.0 all runs: OK # git bisect good 117eda8f71ff545cfdec8fe8073adbd173a1ceff Bisecting: 1077 revisions left to test after this (roughly 10 steps) [0922275ef157ba8ac93e7e7857087eb0442d5397] Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc testing commit 0922275ef157ba8ac93e7e7857087eb0442d5397 with gcc (GCC) 8.1.0 all runs: OK # git bisect good 0922275ef157ba8ac93e7e7857087eb0442d5397 Bisecting: 522 revisions left to test after this (roughly 9 steps) [80b451cd68b490ee612c7f5ca04854d488b4a20d] Merge tag 'imx-dt-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into next/dt testing commit 80b451cd68b490ee612c7f5ca04854d488b4a20d with gcc (GCC) 8.1.0 all runs: OK # git bisect good 80b451cd68b490ee612c7f5ca04854d488b4a20d Bisecting: 268 revisions left to test after this (roughly 8 steps) [b7badd1d7aa61087010803affa19bb83fb5a0af1] Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc testing commit b7badd1d7aa61087010803affa19bb83fb5a0af1 with gcc (GCC) 8.1.0 run #0: OK run #1: crashed: WARNING: ODEBUG bug in netdev_freemem run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad b7badd1d7aa61087010803affa19bb83fb5a0af1 Bisecting: 118 revisions left to test after this (roughly 7 steps) [826833df4e4b396beef6420647aabe409bd84533] Merge tag 'omap-for-v4.21/dt-ti-sysc-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/dt testing commit 826833df4e4b396beef6420647aabe409bd84533 with gcc (GCC) 8.1.0 all runs: OK # git bisect good 826833df4e4b396beef6420647aabe409bd84533 Bisecting: 60 revisions left to test after this (roughly 6 steps) [4a598c7b3f00e30148a3cc2e314961328f8a277e] Merge tag 'tegra-for-4.21-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/drivers testing commit 4a598c7b3f00e30148a3cc2e314961328f8a277e with gcc (GCC) 8.1.0 all runs: OK # git bisect good 4a598c7b3f00e30148a3cc2e314961328f8a277e Bisecting: 32 revisions left to test after this (roughly 5 steps) [389cf4e42e204fd0117318054a4abf18ef8f80d4] Merge tag 'tegra-for-4.21-memory' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/drivers testing commit 389cf4e42e204fd0117318054a4abf18ef8f80d4 with gcc (GCC) 8.1.0 run #0: crashed: WARNING: locking bug in corrupted run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 389cf4e42e204fd0117318054a4abf18ef8f80d4 Bisecting: 14 revisions left to test after this (roughly 4 steps) [bb7ece5fc43fb597ff965c79ddd62c3806f3e319] Merge tag 'sunxi-drivers-for-4.21' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux into next/drivers testing commit bb7ece5fc43fb597ff965c79ddd62c3806f3e319 with gcc (GCC) 8.1.0 all runs: OK # git bisect good bb7ece5fc43fb597ff965c79ddd62c3806f3e319 Bisecting: 6 revisions left to test after this (roughly 3 steps) [e3154317a063051a66231d43736276b5e3402f83] Merge tag 'imx-drivers-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into next/drivers testing commit e3154317a063051a66231d43736276b5e3402f83 with gcc (GCC) 8.1.0 all runs: OK # git bisect good e3154317a063051a66231d43736276b5e3402f83 Bisecting: 4 revisions left to test after this (roughly 2 steps) [446e8986a2417148aed14f362831bf2425d434cb] ARM: at91: add support in soc driver for new SAM9X60 testing commit 446e8986a2417148aed14f362831bf2425d434cb with gcc (GCC) 8.1.0 all runs: OK # git bisect good 446e8986a2417148aed14f362831bf2425d434cb Bisecting: 2 revisions left to test after this (roughly 1 step) [d1a1cc9a3fadeb14ba71abd54de8b89a37113a56] Merge tag 'amlogic-drivers-2' of https://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-amlogic into next/drivers testing commit d1a1cc9a3fadeb14ba71abd54de8b89a37113a56 with gcc (GCC) 8.1.0 all runs: OK # git bisect good d1a1cc9a3fadeb14ba71abd54de8b89a37113a56 Bisecting: 1 revision left to test after this (roughly 1 step) [96e5da7c842424bcf64afe1082b960b42b96190b] memory: tegra: Introduce Tegra20 EMC driver testing commit 96e5da7c842424bcf64afe1082b960b42b96190b with gcc (GCC) 8.1.0 run #0: crashed: WARNING in batadv_mcast_mla_update run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 96e5da7c842424bcf64afe1082b960b42b96190b 96e5da7c842424bcf64afe1082b960b42b96190b is the first bad commit commit 96e5da7c842424bcf64afe1082b960b42b96190b Author: Dmitry Osipenko Date: Sun Oct 21 21:30:52 2018 +0300 memory: tegra: Introduce Tegra20 EMC driver Introduce driver for the External Memory Controller (EMC) found on Tegra20 chips, which controls the external DRAM on the board. The purpose of this driver is to program memory timing for external memory on the EMC clock rate change. Signed-off-by: Dmitry Osipenko Acked-by: Peter De Schrijver Signed-off-by: Thierry Reding drivers/memory/tegra/Kconfig | 10 + drivers/memory/tegra/Makefile | 1 + drivers/memory/tegra/tegra20-emc.c | 591 +++++++++++++++++++++++++++++++++++++ 3 files changed, 602 insertions(+) create mode 100644 drivers/memory/tegra/tegra20-emc.c revisions tested: 15, total time: 3h52m51.245416598s (build: 1h18m18.52306471s, test: 2h31m28.464616902s) first bad commit: 96e5da7c842424bcf64afe1082b960b42b96190b memory: tegra: Introduce Tegra20 EMC driver cc: ["digetx@gmail.com" "jonathanh@nvidia.com" "linux-kernel@vger.kernel.org" "linux-tegra@vger.kernel.org" "pdeschrijver@nvidia.com" "thierry.reding@gmail.com" "treding@nvidia.com"] crash: WARNING in batadv_mcast_mla_update team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed bond0 (unregistering): Releasing backup interface bond_slave_1 bond0 (unregistering): Releasing backup interface bond_slave_0 bond0 (unregistering): Released all slaves WARNING: CPU: 0 PID: 8 at net/batman-adv/multicast.c:371 __batadv_mcast_mla_update net/batman-adv/multicast.c:631 [inline] WARNING: CPU: 0 PID: 8 at net/batman-adv/multicast.c:371 batadv_mcast_mla_update+0x1ecb/0x2cb0 net/batman-adv/multicast.c:661 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 4.20.0-rc1+ #1 kobject: 'loop0' (00000000078528c7): kobject_uevent_env Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 Workqueue: bat_events batadv_mcast_mla_update Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1cc/0x2f4 lib/dump_stack.c:113 panic+0x212/0x3c9 kernel/panic.c:188 __warn.cold.8+0x1b/0x40 kernel/panic.c:540 report_bug+0x1a4/0x200 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969 RIP: 0010:batadv_mcast_mla_tt_add net/batman-adv/multicast.c:371 [inline] RIP: 0010:__batadv_mcast_mla_update net/batman-adv/multicast.c:636 [inline] RIP: 0010:batadv_mcast_mla_update+0x1ecb/0x2cb0 net/batman-adv/multicast.c:661 Code: 41 fa ff ff 49 c1 ed 03 be f8 f8 ff ff 48 c1 eb 03 48 b8 00 00 00 00 00 fc ff df 66 41 89 74 05 00 c6 04 03 f8 e9 b5 eb ff ff <0f> 0b e9 47 e8 ff ff 48 89 df e8 46 67 37 fa 4c 8d 55 d8 e9 47 e3 RSP: 0018:ffff88002d3ef340 EFLAGS: 00010202 RAX: 0000000000000121 RBX: dffffc0000000000 RCX: 1ffff10005a7c919 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000286 RBP: ffff88002d3ef738 R08: ffff88002d3e48c8 R09: 0000000000000006 R10: ffff88002d3ef710 R11: ffff88002d3e4000 R12: ffff88002d3ef490 R13: 1ffff10005a7de92 R14: ffff88002d3ef490 R15: ffff88006eef9110 process_one_work+0xadf/0x1ad0 kernel/workqueue.c:2153 kobject: 'loop0' (00000000078528c7): fill_kobj_path: path = '/devices/virtual/block/loop0' worker_thread+0x176/0x12a0 kernel/workqueue.c:2296 kthread+0x327/0x3f0 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..